This document provides a sample question paper for Chemistry (043) Class XII. It includes the design of the question paper with the breakdown of marks for different question types. It also provides a blue print of the syllabus distribution and the difficulty level of questions. Sample questions are provided for Very Short Answer, Short Answer and Long Answer questions along with the suggested marking scheme. The document aims to help students prepare for the exam by understanding the format and coverage of the question paper.
This document contains a 50 question chemistry practice test with multiple choice answers for each question. The test covers topics such as organic chemistry, inorganic chemistry, physical chemistry, and more. Each question provides 4 possible answer choices with only one being correct.
The document summarizes an experiment to investigate the rate of reaction between hydrogen peroxide and manganese (IV) oxide catalyst. It includes the balanced reaction equation, a diagram of the apparatus used to collect oxygen gas produced, and results from a rate experiment. Finely powdered catalyst is expected to react faster than coarsely powdered catalyst due to its greater surface area. The results are plotted in a graph, from which the volume of oxygen produced after 2.5 minutes and the instantaneous rate at that time can be determined. A lower concentration solution is predicted to have a less steep rise and level off earlier in the graph.
This document provides a sample question paper for Chemistry (Class XII). It includes:
1. Details on the types of questions and their marks, totaling 70 marks.
2. The first few questions of the paper on topics like gas adsorption, noble gas species, and salt dissociation.
3. Instructions for the exam, including the time allowed and that calculators are not permitted.
This document provides the instructions and questions for a chemistry exam. It is divided into short answer questions worth 1-3 marks each and long answer questions worth 5 marks each. The short answer questions cover topics like organic reactions, electrolytes, thermodynamics, and acid-base chemistry. The long answer questions require explaining concepts like crystal structures, isomerism, and corrosion processes. Students have 3 hours to complete the exam, which is out of a total of 70 marks. Calculators are not allowed.
The document describes the process for selecting the German team for the International Chemistry Olympiad (IChO), which involves 4 rounds of testing. Students first complete problems at home, then the top scorers advance to chemistry camps involving theoretical and practical exams. The top 15 students then participate in a final week-long practical training camp, after which the IChO team is selected. The document also provides the problems and solutions for each round of the national competition.
Cbse class 12 chemistry sample paper 05 (for 2013)mycbseguide
This document contains a 30 question chemistry exam with questions ranging from 1 to 5 marks. It provides instructions on answering questions of different mark values and includes questions testing a range of chemistry concepts. Example questions ask about crystal structure, IUPAC naming, reaction mechanisms, equilibrium constants, colligative properties and organic synthesis.
(i) The document provides 15 solubility product (Ksp) problems involving calculation of solubility, concentration of ions, and value of Ksp for various salts.
(ii) It also provides 12 additional problems involving effect of common ions on solubility, calculation of solubility in presence of other salts, and percentage saturation.
(iii) The problems cover concepts including dissociation of salts into ions, calculation of solubility and concentration using Ksp expression, and effect of common ions in altering solubility.
This document is a 35 question practice test for the AIEEE chemistry exam that covers topics like organic chemistry reactions, inorganic compounds, thermodynamics, and quantum mechanics. It provides the questions, answers, and a note that the key and any updates can be accessed online. The test was prepared by V. Aditya vardhan as practice for competitive exams beyond just the AIEEE.
This document contains an unsolved chemistry practice paper from 2011 for IIT JEE with multiple choice and integer answer questions covering topics like gases, organic chemistry reactions, acid-base chemistry, and coordination complexes. The paper has 4 sections - single answer multiple choice questions, multiple answer multiple choice questions, paragraph style questions, and integer answer questions. It provides the questions along with some context but no solutions.
The document is a chemistry exam from 1998 containing 45 multiple choice questions related to various chemistry topics. The questions cover areas such as solutions, organic chemistry reactions, coordination compounds, acid-base chemistry, and more. The questions are single-answer multiple choice with 4 options labeled a, b, c, or d for each question.
The document provides instructions for a 3 hour exam with 84 questions across 3 subjects (Chemistry, Mathematics, Physics). It details how to fill out the answer sheet, the question format and marking scheme. The exam contains multiple choice, multiple correct, and comprehension question types across 4 sections for each subject. Negative marks may be given for some incorrect answers. Useful data on constants, atomic numbers, and formulas are also provided.
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Section 7 organic practicals exam questionsMartin Brown
The document contains questions and information about organic chemistry experiments performed in a school laboratory setting, including:
1) The preparation of soap from lard (animal fat) and sodium hydroxide involves refluxing the reactants with ethanol to allow saponification.
2) Ethanal can be prepared by oxidizing ethanol with sodium dichromate and sulfuric acid. Fehling's test confirms the presence of an aldehyde.
3) Chromatography, including paper, thin-layer, and column chromatography, can be used to separate mixtures like indicators based on differences in compounds' polarity and interactions with the mobile and stationary phases.
This document provides a sample chemistry question paper for Class XII. It includes:
1) Details on the number and type of questions, including short answer, long answer and value based questions.
2) Instructions for students on completing the paper.
3) Sample questions covering topics in chemistry like thermodynamics, equilibrium, redox reactions, organic chemistry and biomolecules.
4) A value based question assessing students' ability to apply chemistry knowledge to an ethical scenario.
1. The document provides a chemistry practice problems document (DPP) containing multiple choice questions.
2. The DPP covers topics such as chemical equilibrium, equilibrium constants, reaction stoichiometry, and thermochemistry.
3. The document includes the answer key for the 10 questions in DPP No. 15 and the 10 questions in DPP No. 14, providing the correct option for each multiple choice question.
The document provides examples for calculating the Ksp (solubility product constant) of various ionic compounds given their molar solubility in water. It first explains the general process: writing the dissolution reaction, writing the Ksp expression, inserting concentrations based on molar ratios, and calculating the value. Several examples are then worked through step-by-step, calculating Ksp values from molar solubilities for compounds such as silver bromide, calcium fluoride, and mercury(I) bromide. The document also discusses calculating Ksp from solubilities provided in grams per 100mL by first converting to molar solubility. More examples demonstrate this process for nickel sulfide, magnesium fluoride, and manganese(II) i
Kertas 2 pep pertengahan tahun sbp 2011norainiamin
The document provides the marking scheme for Chemistry Paper 1, 2 and 3 for a mid-year exam in 2011. It includes the answers and marks allocated for each question in the three papers. For Paper 1, it lists the answers for 50 multiple choice questions. For Paper 2, it provides the answers and explanations for 9 questions. For Paper 3, it outlines the scoring rubrics for assessing 5 long answer questions on topics like the effect of temperature on reaction rate and variables in an experiment. The marking scheme aims to standardize the evaluation of students' responses for the Chemistry mid-year exam across its three papers.
1. The document contains questions related to chemistry concepts and reactions. It asks about the extraction of copper, placement of hydrogen in the periodic table, properties of hydrides, thermal stability of carbonates, redox reactions involving iron and chlorine, and acid-base reactions.
2. Multiple choice and structured questions are asked about definitions, distinguishing compounds, reaction mechanisms, and thermodynamic calculations using standard enthalpies of formation and combustion.
3. Questions cover topics like metallurgy, extraction of tin, partitioning, Hess's law, and distinguishing between coordination number, paramagnetism, and ligand strength. Relevant examples and equations are provided in the answers.
1. The document discusses sample papers for Class 12 Chemistry that are published by a private organization for student practice. It states that CBSE has not released these papers and is not related to them. (Section A)
2. It provides instructions for the sample paper, which has multiple choice, very short, short, and long answer questions worth varying marks. The paper covers topics like kinetics, equilibrium, redox, coordination chemistry etc. (Section B, C, D, E)
3. It clarifies that while the papers can be used for practice, the questions may not appear in the actual exam, and people should not spread rumors about question papers.
This document contains a chemistry revision paper with 30 questions covering topics on the solid state and chemical kinetics. It provides instructions for the exam, including the number of marks allocated to each question and guidelines on using tables or calculators. The questions range from 1 to 5 marks and cover various concepts such as stoichiometric defects, rate constants, crystal structures, reaction orders, and activation energy. Graphical and numerical problems are included to calculate values like half-lives, rate constants, and Arrhenius parameters from experimental data. Definitions and examples are also tested around terms like isotropic, amorphous solids, and ferromagnetism. Reaction mechanisms and rate laws are analyzed for some hypothetical chemical reactions.
This document provides a chemistry sample paper with 30 questions covering various topics in chemistry. It includes very short answer questions (1 mark), short answer questions (2-3 marks) and long answer questions (5 marks). The questions test a range of concepts including stoichiometry, gas laws, equilibrium, electrochemistry, organic chemistry and more. Sample solutions are provided for some questions to illustrate the expected level of detail in the responses. The document serves as a practice test for students to evaluate their understanding of key chemistry concepts.
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This document contains a 30 question chemistry exam covering topics like:
- Properties and reactions of ionic/metallic substances
- Acid-base chemistry and nomenclature
- Thermochemistry and reaction kinetics
- Electrochemistry and metal extraction/refining methods
- Organic chemistry reactions, naming, and spectroscopy
The questions test understanding of concepts like conductivity, acidity, polymerization, enzyme catalysis, and require solving problems involving calculations with equations, concentrations, and thermodynamic quantities.
This document contains a 30 question chemistry exam covering various topics in chemistry including:
- Properties and reactions of ionic and metallic substances
- Coagulation processes and pyrometallurgy
- IUPAC naming of compounds
- Factors affecting melting points of carboxylic acids
- Relative reactivities and properties of white vs red phosphorus
- Relative basic strengths of amines
- Primary structural features of condensation polymerization
- Lead acid battery reactions
- Effect of temperature on reaction rates
- Principles of zone refining and van Arkel methods
- Properties of NF3 and bonds in SF4
- Balancing chemical equations
- Solubility properties of alcohols
This document provides a sample chemistry exam paper with 30 questions testing various concepts in chemistry. The questions cover topics like stoichiometry, gas laws, electronic configuration, periodic properties, chemical bonding, thermodynamics, and organic chemistry. The paper tests knowledge through calculations, explaining concepts, deriving relationships, and predicting properties and reactions. It provides worked solutions for multiple choice and multi-part questions assessing a range of skills in chemistry.
The document provides instructions for a sample chemistry, mathematics, and physics exam. It consists of 3 parts with 30 questions each, for a total of 90 questions worth 360 marks. For each correct answer, candidates will receive 4 marks. For each incorrect answer, 1/4 of a mark will be deducted. There can only be one correct answer per question. The test is 3 hours long.
1. The document contains an unsolved chemistry practice test with 43 multiple choice questions and answers related to topics like atomic structure, chemical bonding, thermodynamics, kinetics and equilibrium.
2. The questions cover concepts such as Bohr model, de Broglie wavelength, Lewis structures, IUPAC naming, acid-base reactions, salt solubility, electrolysis, redox reactions, colligative properties, rate laws, free energy and entropy changes.
3. The document tests understanding of fundamental chemistry principles as well as the ability to apply these principles to solve quantitative problems.
1. The document contains an unsolved chemistry practice test with 43 multiple choice questions and answers related to topics like atomic structure, chemical bonding, thermodynamics, kinetics and equilibrium.
2. The questions cover concepts such as Bohr model, de Broglie wavelength, Lewis structures, IUPAC naming, acid-base reactions, salt solubility, electrochemistry and more.
3. The document provides the questions and answer options but does not include the correct answers. It is intended as a practice test for students or as a reference for teachers.
1. This document contains an unsolved chemistry exam paper from 2003 with 43 multiple choice questions covering topics like atomic structure, chemical bonding, thermodynamics, kinetics and equilibrium.
2. The questions test understanding of concepts like Bohr model, de Broglie wavelength, Lewis structures, IUPAC naming, acid-base reactions, salt solubility, electrolysis, redox reactions and more.
3. The document provides the questions and multiple choice answers but no solutions, making it a challenging practice exam for reviewing core chemistry topics.
This document contains an unsolved chemistry practice test from 2004 with 50 multiple choice questions covering various topics in chemistry including quantum numbers, atomic structure, chemical bonding, acid-base reactions, solutions, equilibrium, electrochemistry, and coordination compounds. The questions require selecting the best answer from four choices given for each problem.
This document contains a 30 question multiple choice quiz on inorganic chemistry topics including crystal field theory, coordination complexes, organometallic chemistry, and acid-base chemistry in non-aqueous solvents. The questions cover topics such as ligand properties, d-orbital splitting, reaction mechanisms, electronic configurations, and biological roles of metal ions. An answer key is provided at the end with the correct response for each question lettered a-d.
Seminar april revision form 5== chapter electrchemistry, carbon compound and ...MRSMPC
The document summarizes several topics in chemistry including electrochemistry, carbon compounds, and thermochemistry. It provides diagrams and questions about electrolytic and voltaic cells, organic reactions involving ethanol, and experiments to determine heat of precipitation of PbSO4 and heat of displacement of copper from CuSO4 solution. Key points covered include labeling anode and cathode, writing ionic equations, stating products and factors that determine products, and calculating heat of reactions from temperature changes.
Seminar revision on chapter electrchemistry, carbon compound and thermo che...MRSMPC
1) The document summarizes topics on electrochemistry, carbon compounds, and thermochemistry covered in a seminar for chemistry form 5 students. It includes diagrams of electrolytic and voltaic cells and questions related to these topics.
2) Organic reactions involving ethene, ethanol and ethanoic acid are summarized including reagents, conditions, and equations.
3) Data from an experiment to determine the heat of precipitation of PbSO4 is presented and used to calculate the heat of precipitation.
Seminar revision on chapter electrchemistry, carbon compound and thermo che...MRSMPC
1) The document summarizes topics on electrochemistry, carbon compounds, and thermochemistry covered in a seminar for chemistry form 5 students. It includes diagrams of electrolytic and voltaic cells and questions related to these topics.
2) Organic reactions involving ethene, ethanol and ethanoic acid are presented along with questions about the reactions and conditions.
3) A student's experiment to determine the heat of precipitation of lead (II) sulfate is described. The heat of precipitation is calculated to be -50.4 kJ/mol.
The document provides a chemistry exam paper from 2004 containing 40 multiple choice questions testing various concepts in chemistry. The questions cover topics such as photon mass, quantum numbers, bond orders, molecular orbitals, acidity trends, coordination complexes stability, hydrogenation reactions, isomerism, hybridization, electrode potentials, nuclear reactions, organic naming/structure, polymers, DNA, dyes, and pharmaceutical drugs.
Beyond the Advance Presentation for By the Book 9John Rodzvilla
In June 2020, L.L. McKinney, a Black author of young adult novels, began the #publishingpaidme hashtag to create a discussion on how the publishing industry treats Black authors: “what they’re paid. What the marketing is. How the books are treated. How one Black book not reaching its parameters casts a shadow on all Black books and all Black authors, and that’s not the same for our white counterparts.” (Grady 2020) McKinney’s call resulted in an online discussion across 65,000 tweets between authors of all races and the creation of a Google spreadsheet that collected information on over 2,000 titles.
While the conversation was originally meant to discuss the ethical value of book publishing, it became an economic assessment by authors of how publishers treated authors of color and women authors without a full analysis of the data collected. This paper would present the data collected from relevant tweets and the Google database to show not only the range of advances among participating authors split out by their race, gender, sexual orientation and the genre of their work, but also the publishers’ treatment of their titles in terms of deal announcements and pre-pub attention in industry publications. The paper is based on a multi-year project of cleaning and evaluating the collected data to assess what it reveals about the habits and strategies of American publishers in acquiring and promoting titles from a diverse group of authors across the literary, non-fiction, children’s, mystery, romance, and SFF genres.
AI Risk Management: ISO/IEC 42001, the EU AI Act, and ISO/IEC 23894PECB
As artificial intelligence continues to evolve, understanding the complexities and regulations regarding AI risk management is more crucial than ever.
Amongst others, the webinar covers:
• ISO/IEC 42001 standard, which provides guidelines for establishing, implementing, maintaining, and continually improving AI management systems within organizations
• insights into the European Union's landmark legislative proposal aimed at regulating AI
• framework and methodologies prescribed by ISO/IEC 23894 for identifying, assessing, and mitigating risks associated with AI systems
Presenters:
Miriama Podskubova - Attorney at Law
Miriama is a seasoned lawyer with over a decade of experience. She specializes in commercial law, focusing on transactions, venture capital investments, IT, digital law, and cybersecurity, areas she was drawn to through her legal practice. Alongside preparing contract and project documentation, she ensures the correct interpretation and application of European legal regulations in these fields. Beyond client projects, she frequently speaks at conferences on cybersecurity, online privacy protection, and the increasingly pertinent topic of AI regulation. As a registered advocate of Slovak bar, certified data privacy professional in the European Union (CIPP/e) and a member of the international association ELA, she helps both tech-focused startups and entrepreneurs, as well as international chains, to properly set up their business operations.
Callum Wright - Founder and Lead Consultant Founder and Lead Consultant
Callum Wright is a seasoned cybersecurity, privacy and AI governance expert. With over a decade of experience, he has dedicated his career to protecting digital assets, ensuring data privacy, and establishing ethical AI governance frameworks. His diverse background includes significant roles in security architecture, AI governance, risk consulting, and privacy management across various industries, thorough testing, and successful implementation, he has consistently delivered exceptional results.
Throughout his career, he has taken on multifaceted roles, from leading technical project management teams to owning solutions that drive operational excellence. His conscientious and proactive approach is unwavering, whether he is working independently or collaboratively within a team. His ability to connect with colleagues on a personal level underscores his commitment to fostering a harmonious and productive workplace environment.
Date: June 26, 2024
Tags: ISO/IEC 42001, Artificial Intelligence, EU AI Act, ISO/IEC 23894
-------------------------------------------------------------------------------
Find out more about ISO training and certification services
Training: ISO/IEC 42001 Artificial Intelligence Management System - EN | PECB
Webinars: https://pecb.com/webinars
Article: https://pecb.com/article
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How to Store Data on the Odoo 17 WebsiteCeline George
Here we are going to discuss how to store data in Odoo 17 Website.
It includes defining a model with few fields in it. Add demo data into the model using data directory. Also using a controller, pass the values into the template while rendering it and display the values in the website.
Satta Matka Dpboss Kalyan Matka Results Kalyan ChartMohit Tripathi
SATTA MATKA DPBOSS KALYAN MATKA RESULTS KALYAN CHART KALYAN MATKA MATKA RESULT KALYAN MATKA TIPS SATTA MATKA MATKA COM MATKA PANA JODI TODAY BATTA SATKA MATKA PATTI JODI NUMBER MATKA RESULTS MATKA CHART MATKA JODI SATTA COM INDIA SATTA MATKA MATKA TIPS MATKA WAPKA ALL MATKA RESULT LIVE ONLINE MATKA RESULT KALYAN MATKA RESULT DPBOSS MATKA 143 MAIN MATKA KALYAN MATKA RESULTS KALYAN CHART
Kalyan Matka Kalyan Result Satta Matka Result Satta Matka Kalyan Satta Matka Kalyan Open Today Satta Matka Kalyan
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Credit limit improvement system in odoo 17Celine George
In Odoo 17, confirmed and uninvoiced sales orders are now factored into a partner's total receivables. As a result, the credit limit warning system now considers this updated calculation, leading to more accurate and effective credit management.
How to Show Sample Data in Tree and Kanban View in Odoo 17Celine George
In Odoo 17, sample data serves as a valuable resource for users seeking to familiarize themselves with the functionalities and capabilities of the software prior to integrating their own information. In this slide we are going to discuss about how to show sample data to a tree view and a kanban view.
The Jewish Trinity : Sabbath,Shekinah and Sanctuary 4.pdfJackieSparrow3
we may assume that God created the cosmos to be his great temple, in which he rested after his creative work. Nevertheless, his special revelatory presence did not fill the entire earth yet, since it was his intention that his human vice-regent, whom he installed in the garden sanctuary, would extend worldwide the boundaries of that sanctuary and of God’s presence. Adam, of course, disobeyed this mandate, so that humanity no longer enjoyed God’s presence in the little localized garden. Consequently, the entire earth became infected with sin and idolatry in a way it had not been previously before the fall, while yet in its still imperfect newly created state. Therefore, the various expressions about God being unable to inhabit earthly structures are best understood, at least in part, by realizing that the old order and sanctuary have been tainted with sin and must be cleansed and recreated before God’s Shekinah presence, formerly limited to heaven and the holy of holies, can dwell universally throughout creation
No, it's not a robot: prompt writing for investigative journalismPaul Bradshaw
How to use generative AI tools like ChatGPT and Gemini to generate story ideas for investigations, identify potential sources, and help with coding and writing.
A talk from the Centre for Investigative Journalism Summer School, July 2024
How to Configure Time Off Types in Odoo 17Celine George
Now we can take look into how to configure time off types in odoo 17 through this slide. Time-off types are used to grant or request different types of leave. Only then the authorities will have a clear view or a clear understanding of what kind of leave the employee is taking.
Still I Rise by Maya Angelou
-Table of Contents
● Questions to be Addressed
● Introduction
● About the Author
● Analysis
● Key Literary Devices Used in the Poem
1. Simile
2. Metaphor
3. Repetition
4. Rhetorical Question
5. Structure and Form
6. Imagery
7. Symbolism
● Conclusion
● References
-Questions to be Addressed
1. How does the meaning of the poem evolve as we progress through each stanza?
2. How do similes and metaphors enhance the imagery in "Still I Rise"?
3. What effect does the repetition of certain phrases have on the overall tone of the poem?
4. How does Maya Angelou use symbolism to convey her message of resilience and empowerment?
Views in Odoo - Advanced Views - Pivot View in Odoo 17Celine George
In Odoo, the pivot view is a graphical representation of data that allows users to analyze and summarize large datasets quickly. It's a powerful tool for generating insights from your business data.
The pivot view in Odoo is a valuable tool for analyzing and summarizing large datasets, helping you gain insights into your business operations.
The Value of Time ~ A Story to Ponder On (Eng. & Chi.).pptxOH TEIK BIN
A PowerPoint presentation on the importance of time management based on a meaningful story to ponder on. The texts are in English and Chinese.
For the Video (texts in English and Chinese) with audio narration and explanation in English, please check out the Link:
https://www.youtube.com/watch?v=lUtjLnxEBKo
The Value of Time ~ A Story to Ponder On (Eng. & Chi.).pptx
Chemistry(1)
1. SAMPLE QUESTION PAPER
CHEMISTRY (043)
CLASS XII (2013-14)
Design of Question paper
Time: 3 hrs. Maximum Marks:70
A. Weightage to different forms of questions
S. No. Type of
question
Marks per
Question
Total number
of Questions
Total
marks
1 VSA 1 8 8
2 SA I 2 10 20
3 SA II/Value
Based
Question
3 9 27
4 LA 5 3 15
Total 30 70
B. Typology of Questions
S.
No.
Typology Weightage in
marks
Weightage in
percentage
1 Knowledge Based 14 20%
2
Conceptual
Understanding
21 30%
3 Inferential Type 14 20%
4 Reasoning Based 11 15%
5 Skill Based 10 15%
Total 70 100%
2. C. Scheme of options
There will be no overall choice. However, internal choice in any one question
of two marks, any one question of three marks and all the three questions of
five marks weightage has been provided.
D. Difficulty level of questions
S. No. Estimated difficulty
level
Percentage of marks
1 Easy 15
2 Average 70
3 Difficult 15
3. SAMPLE QUESTION PAPER
CHEMISTRY (043)
CLASS-XII – (2013-14)
BLUE PRINT
Time Allowed: 3 Hrs. Maximum Marks:70
S.No. UNIT
VSA
(1 Mark)
SAI
(2
Marks)
SAII(3)/
Value
based
question
(3marks)
LA
(5 marks) TOTAL
1. Solid State 4(2) 4 (2)
2. Solutions 5 (1) 5 (1)
3. Electrochemistry 2(1) *3(1) 5(2)
4. Chemical Kinetics 1(1) 4(2) 5(3)
5. Surface Chemistry 1(1) 3(1) 4(2)
6. General Principles and Processes 3(1) 3(1)
of Isolation of Elements
7. p-block Elements 1(2) 3(2) 8(4)
8. d & f- Block Elements 5(1) 5(1)
9. Co-ordination Compounds 1(1) 2(1) 3(2)
10. Haloalkanes and Haloarenes 2(2) 4(2)
11. Alcohols, Phenols & Ethers 1(1) 3(1) 4(2)
12. Aldehydes, Ketones & Carboxylic 1(1) 5(1) 6(2)
Acids
13. Organic Compounds Containing 4(2) 4(2)
Nitrogen
14. Biomolecules 1(1) 3(1) 4(2)
15. Polymers 3(1) 3(1)
16. Chemistry in Everyday Life 3(1) 3(1)
Total: 8(8) 20(10) 27(9) 15(3) 70(30)
Key: Total marks (no. of questions)
* Value Based Question
NOTE :
- Value Based Questions may be asked from any unit / chapter / topic.
- It will carry 3-5 marks.
4. SAMPLE QUESTION PAPER
CHEMISTRY (043)
CLASS-XII – (2013-14)
Time Allotted: 3 Hrs Maximum Marks: 70
General Instructions:
1. All questions are compulsory.
2. Question No. 1-8 are very short answer questions and carry 1 mark each.
3. Question No. 9-18 are short answer questions and carry 2 marks each.
4. Question No. 19-27 are also short answer questions and carry 3 marks each.
5. Question No. 28-30 are long answer questions and carry 5 marks each.
6. Use log tables if necessary, use of calculators is not allowed.
Q.1 Bond enthalpy of fluorine is lower than that of chlorine, why?
Q.2 Give the IUPAC name of the following compound:
(CH3)3-C-C-COOH
║
O
Q.3 On increasing temperature, activation energy of a reaction decreases, why?
Q 4 Which of the following is most effective electrolyte in the coagulative of AgI/Ag+sol?
K2SO4, MgCl2, K4[Fe(CN)6]
Q.5 Write the reaction when glucose is heated with excess of HI.
Q.6 Which Xe compound has distorted octahedral shape?
Q.7 What is the denticity of co-ordination compound used for the treatment of lead Poisoning?
Q.8 An alkoxide is a stronger base than hydroxide ion. Justify.
Q.9 (a) State the law which helps to determine the limiting molar conductivity of weak
electrolyte.
(b) Calculate limiting molar conductivity of CaSO4 (limiting molar conductivity of
calcium and sulphate ions are 119.0 and160.0 S cm
2
mol
-1
respectively).
Q.10 Rate constant K for first order reaction has been found to be 2.54 x 10
-3
sec
-1
. Calculate its
three-fourth life.
OR
A first order gas reaction A2(g)B2(g) → 2A(g) + 2B(g) at the temperature 400
0
C has the rate
Constant K =2.0x10
-4
sec
-1
. What percentage of A2B2 is decomposed on heating for 900
seconds.
5. Q.11 Do the following conversions:
(i) Methyl bromide to acetone.
(ii) Benzyl chloride to 2-phenyl acetic acid.
Q.12 How will you distinguish between the following pairs of compounds:
(i) Chloroform and carbon tetra chloride.
(ii) Benzyl alcohol and chlorobenzene.
Q.13 For a chemical reaction variation in rate with conc. is shown below:
Rate
Conc.—→
What is the order of the reaction?
What are the units of rate constant K for the reaction?
Q.14 Give the electronic configuration of d-orbitals of K3 [Fe(CN6)] and K3 [FeF6] and
explain why these complexes give different colour with same solution.
(At. No. Of Fe=26u)
Q.15 Give reason for the following:
(i) O-Toludine is more basic than aniline.
(ii) Tertiary amines do not undergo acetylation reaction.
Q.16 Write the following name reaction:
(i) Gabriel phthalimide reaction. (ii)
Hoffman bromamide reaction.
Q.17 Silver metal crystallises with a face centred cubic lattice. The length of unit cell is
found to be 4.077x10
-8
cm. Calculate atomic radius and density of silver.
(atomic mass of Ag = 108u, NA = 6.02x10
23
mol
-1
)
Q.18 Calculate packing efficiency in ccp structure.
6. Q.19 Manu and his father went to a shop to purchase a battery for their inverter.
Shopkeeper showed them two types of batteries, one with lead plates and the
other with cadmium plates. The battery with cadmium plates was more
expensive than the lead battery. They decided to purchase lead battery as it was
cheaper.
After reading the above passage, answer the following questions:
a) As a student of chemistry, why would you suggest to Manu and his father to
buy the expensive cadmium plate battery. Give two reasons.
b) Which two values will you be promoting through your suggestions?
Q.20 Give a reason for the following:
(i) Rough surface of catalyst is more effective than smooth surface.
(ii) Smoke passed through charged plates before allowing it to come out
of chimneys in factories.
(iii) Ne gets easily absorbed over charcoal than He.
Q.21 (a) Give one example of each of the following:
(i) Acidic flux (ii) Basic flux
(b) What happens when:
(i) Cu2O undergoes self reduction in a silica line
converter. (ii) Haematite oxidises carbon to carbon monoxide.
OR
(a) What role does cryolite play in Hall Haraoult process?
(b) How can alumina be separated from silica in a bauxite ore associated
with silica? Give equations also.
Q.22 Write balanced chemical equations for the following reactions.
(a) Hypophosphorous acid is added to AgNO3 solution.
(b) Chlorine gas is passed through hot and concentrated solution of sodium
hydroxide.
(c) XeF2 undergoes hydrolysis.
7. Q.23 (i) Draw the structure of sulphuric acid.
(ii) A sparkless current is passed through oxygen to prepare ozone. why?
(iii) Bleaching action of sulphur is a temporary action .Comment.
Q.24 (i) Give one structural difference between amylose and amylopectin
(ii) Name the protein and its shape present in oxygen carrier in
human body.
(iii) Name two fat storing tissues in human body.
Q.25 Define the following by giving one example of each:
(i) Antiseptics
(ii) Antioxidants
(iii) Narcotic analgesics
Q.26 (a) Write the names of the monomers of polymer used for making
unbreakable crockery. .
(b) write the reaction of preparation of neoprene.
(c) Arrange the following polymers in decreasing order of intermolecular
forces.
PVC, Nylon 66, Natural rubber.
Q.27 Write the mechanism for preparation of ethanol from ethene.
Q.28 (a) What is the freezing point of 0.4 molal solution of acetic acid in
benzene in which it dimerises to the extent of 85%. Freezing point of
benzene is 278.4k and its molar heat of fusion is 10.042kj mol
-1
.
(b) Explain the following:
(i) Solution of chloroform and acetone is an example of maximum boiling
azeotrope.
(ii) A doctor advised a person suffering from high blood pressure to take
less quantity of common salt.
OR
(a) Calculate the boiling point of a solution containing 0.61g of benzoic
acid in 5 g of CS2 .Assuming 84% dimerisation of acid. The boiling
point and Kb of CS2 are 46.2
0
C and 2.3 K Kg mol
-1
respectively.
(b) State Raoult's law for the solution containing non-volatile solute. Give
its mathematical expression also.
Q.29 Account for the following :
8. (i) Transition elements show highest oxidation state in their oxides than
fluorides.
(ii) Cu has positive electrode potential in the first transition series.
(iii) Ionisation enthalpy of lanthanides is higher than actinides.
(iv) Potassium dichromate is a good oxidising agent in acidic medium.
(v) Actinides show more number of oxidation states than lanthanides.
OR
(a) Compare non transition and transition elements on the basis of their
(i) Variability of oxidation states (ii) stability of oxidation states.
(b) Give chemical reactions for the following observations:
(i) Potassium permanganate is a good oxidising agent in basic
medium.
(ii) Inter convertibility of chromate ion and dichromate ion in
aqueous solution depends Upon pH of the solution.
(iii) Potassium permanganate is thermally unstable at 513K.
Q.30. (a) Give names of the reagents to bring about the following transformations:
i) Ethanoic acid to ethanol
ii) Propane-1-ol to propanal
iii) Pent-3-en-2-ol to pent-3-en-2-one
iv) Sodium benzoate to benzene
(b) Arrange the following in the uncreasing order of:
i) Methanal, Propanal, Butanone, Ethanal, Propanone
(nucleophilic addition reaction)
ii) Formaldehyde, Acetone, Acetaldehyde (reactivity towards HCN)
iii) Acetophenone, p-tolualdehyde, p-nitrobenzaldehyde,
Benzaldehyde (nucleophilic addition reaction)
OR
(a) Bring out the following conversions:.
(i) 4-nitrotoluene to 2-bromobenzoic acid.
(ii) Ethylcyanide to 1- phenyl propanone.
(c) Give a reason for the following :
(i) Chloroacetic acid is more acidic than acetic acid.
(ii) Carboxylic acids have higher boiling point than alcohols.
(iii) 4-nitrobenzoic acid is more acidic than 4-methoxy benzoic acid.
9. SAMPLE QUESTION PAPER
CHEMISTRY(043)
MARKING SCHEME
TIME ALLOTED :3 Hrs MAXIMUM MARKS;70
1. Relatively large electron-electron repulsion among the lone pairs of F2 molecule but they are
much closer to each other in Cl2 molecule. 1
2. 3,3-Di methyl-2-oxobutanoic acid. 1
3. Temperature and activation energy are inversely proportional to each other. 1
4. K4[Fe(CN)6] 1
∆
5. CHO-(CHOH)4CH2OH + HI (excess) –———→ n-hexane (C6H14)
6. XeF6 1
7. Name is Ethylenediamine tetraacetate and denticity is 6. 1
8. Due to the presence of an alkyl group higher electron density is found on alkoxide ion. 1
9. (a)Kohlrausch law of independent migration of ions: The limiting molar conductivity of
an electrolyte can be represented as the sum of the individual contribution of the
anions and cations of the electrolyte. 1
(b) Λ
0
m (CaSO4) = λ
0
Ca2 + + λ
0
SO4
2-
= 119.0 S cm
2
mol
-1
+ 106.0 S cm
2
mol
-1
½
= 225.0 S cm
2
mol
-1
. ½
10.
2.303 a
K = —— log —— 1/2
t a-x
2.303 a
t = —— log ——
k a-x
[a = 1, x = ¾]
2.303 1
t3/4 = —— log —— 1/2
2.54 x 10
3
1-3/4
1
t3/4 = 0.9066 x 10
3
x 0.6021
176
10. t3/4 = 5.46 x 10
2
sec
OR
2.303 a
K = —— log —— 1/2
t a-x
2.303 a
2.0 x10
-4
(sec
-1
) = —— log —— 1/2
900 a-x
.
2.0x10
-4
x 900
a
log —— = ———————— = 0.0781 1/2
a-x 2.303
a
taking antilog —— = antilog (0.0781) =1.197
a-x
a = 1.197a - 1.197x
0.197
x = ——— a = 0.1645a 1/2
1.197
Where a = 100, then x = 0.1645 x 100 = 16.45
i.e 16.45 % of initial concentration has changed into products.
OMgBr
dry ether |
H3O
+
Cu
11.(i) CH3Br + Mg ——— —→ CH3MgBr + CH3CHO — — →C— H— →CH3CHOH——→
| | 573K
. CH3 CH3 1
(CH3)2CO
H3O
+
.
(ii) C6H5CH2OH +SOCl2 —→ C6H5CH2Cl + KCN—→ C6H5CH2CN—→ C6H5CH2COOH 1
12. (a) On heating chloroform and carbon tetrachloride with aniline and ethanolic potassium
hydroxide separately chloroform forms pungent smelling isocyanide but carbon tetra
chloride does not form this compound. 1
(b) On adding sodium hydroxide and silver nitrate to both the compounds benzyl chloride 1
forms white precipitate but chlorobenzene does not form white precipitate.
13. (i) Order of reaction is zero. 1
(ii) units of rate constant is mol L
-1
s-
1
1
11. 14. Oxidation state of Fe in K3[Fe(CN)6] is
+3 Configuration of Fe
3+
is [Ar]3d
5
3d 4s 4p
↿ ↿ ↿ ↿ ↿
↿⇃
3d 4s 4p
↿⇃ ↿⇃ ↿
it has 5 unpaired electrons in 3d orbital which get paired leaving behind one unpaired electron only.
In K3[FeF6] oxidation state of Fe is +3 and 5 unpaired electrons are there in 3d orbitals.
3 d 4s 4p
↿ ↿ ↿ ↿ ↿
Because of the presence of different no. of unpaired electrons these impart different colour of same
solution. 1
15.(i) Ortho toludine is more basic than aniline due to the presence of electron releasing methyl
group (+I effect) electron density at nitrogen of NH2 in o-toluidine increases. 1
(ii) Due to the absence of replaceable hydrogen atom at nitrogen. 1
16.(i) Gabriel phathalimide reaction 1
( b) Hoffmann bromamide degradation reaction
R-C-NH2 + Br2 + 4NaOH → R-NH2 + Na2CO3 + 2NaBr + 2H2O 1
║
O
17. Given =a = 4.077 x 10
-8
cm, Z = 4 , M = 108 g mol
-1
NA =6.022 x 10
23
Z x M
= ————— 1/2
a
3
x N A
12. 19. a) -Harmful effects of lead on the human being 2
- as well as on the environment
It is wise to choose sustained long term benefit than short term gain with regard to health/money
Knowledge of chemistry and its relation to environment
b) (i) Environmental protection
(ii) Health concerns 1
20. (i) Rough surface of a catalyst provides more surface area for adsorption. 1
(ii) So that unburnt charged carbon particles get settled between the charged plate leaving behind air free
from pollutants. 1
(iii) Ne has higher critical temperature i.e stronger vander waal,
s forces therefore easily adsorbed. 1
13. 21 (a) Acidic flux is SiO2 1/2
Basic flux is CaO 1/2
(b)
(i) Cu2O undergoes self reduction to form blister copper as
2Cu2O + Cu2S ——→ 6Cu + SO2 1
(ii) Fe2O3 + 3C ——→ 3CO + 2Fe 1
OR
(a) Cryolite reduces melting point of alumina . 1
(b) Concentration of ore is carried out by digesting the powdered ore with a concentrated solution of
NaOH at 473-523 K and 35 -36 bar pressure. Al2O3 is leached out as sodium meta aluminate and SiO2 as sodium
silicate leaving behind impurities.
Al2O3 (s) + 2 NaOH(aq) + 3H2O → 2Na[Al(OH)4] (aq) 1
The resulting solution is filtered, cooled and neutralised by passing CO2 gas through it. Then hydrated Al2O3
gets precipitated leaving sodium silicate in the solution.
2Na[Al(OH)4] (aq) + CO2(g) — →Al2O3.xH2O(s) + 2NaHCO3(aq) 1/2
Sodium silicates remain in the solution and hydrated alumina is filtered , washed, dried and heated to get pure
alumina (Al2O3).
1470K
Al2O3 .x H2O(s) ——— → Al2O3(s) + x H2O(g) 1/2
22.(i) H3PO3 + 2AgNO3 + H2O —— → 2Ag + HNO 3+ 2 H3PO4 1
(ii) 3Cl2 +6 NaOH (conc.) —— → 5NaCl + NaClO3 +3 H2O 1
(iii) 2XeF2 + 2H2O —— → 2Xe + O2 +4 H+
+ 4F-
1
14. 23(i)
1
(ii) Since the formation of ozone from oxygen is endothermic reaction silent electric discharge prevents its
decomposition. 1
(iii) Bleaching by sulphur dioxide is temporary because of its reducing nature. 1
24 (i) Amylose is a long unbranched chain polymer -D(+) glucose. 1/2
Amylopectin is a branched chain polymer of -D glucose. 1/2
(ii) Globular protein and its shape is spherical. ½ +1/2
(iii) Liver and adipose tissue. ½ +1/2
25. (i) Antiseptics are the chemicals applied to the living tissues either to kill or prevent the growth of
microorganisms .e.g dettol. ½ +1/2
(ii) Antioxidants are the compounds which retard the action of oxygen on food and reduces its rate of
decomposition by oxidation.e.g BHA ½+1/2
15. (iii) Narcotic analgesics are the chemicals used for the relief of post operative pain.e.g morphine.1
26. (i) Monomers of the polymer are melamine and formaldehyde. ½+1/2
polymerisation
(ii) n CH2=C-CH=CH2————— —→ —[ —CH2-C =CH-CH2 —]n— 1
| |
Cl Cl
(iii) Nylon66 > Natural rubber > PVC
27.
1
1
28 : : Given, m= 0.4, Tf
0
= 278.4, ∆Hfus = 10.042 KJ mol-1
RTf
2
M 8.34 x 103
x (278.4)2
x 78
Kf = ——— = ——————————— = 5.0 K Kg mol-1
½ + ½
16. 1000 x∆Hfus 1000 x 10.042
2CH3COOH————→ (CH3COOH)2
i-1 i-1
α = ——— = ——— 1/2
1/n -1 ½
i-1
= ——— = 0.85
1/2 -1
= i-1 = -0.425 1/2
i = 0.575
∆Tf = I Kf m = 0.575 x 5 x 0.4 = 1.15
Tf = Tf
0
- ∆Tf = 278.4 – 1.15 = 277.25 K ½ + 1/2
(b) i) This solution has lesser vapour pressure due to stronger interactions between chloroform and acetone
molecules. 1
ii) Because higher quantity of NaCl will increase no. of sodium and chloride ions in the body fluid which can
increase the osmotic pressure of body fluid i.e blood pressure of a person. 1
OR
2C6H5COOH ———→ (C6H5COOH)2 1
17. i -1 i -1
α = —————— = 0.84 = ————— ½ +1/2
1/n – 1 ½ -1
0.84
i = 1 - —————— = 1 -0.42 =0.58
2
Normal molar mass of benzoic acid =122g mol-1
∆Tb =i.Kb . m = 0.58 x 2.3 x0.1 = 0.13340
C ½+1/2
Tb = Tb0
+ ΔTb = 46.2 + 0.1334 = 46.3340
C
(b)Raoult,s law: The relative lowering of vapour pressure of the solvent over a solution is equal to the mol
fraction of non-volatile solute present in the solution. 1+1
P0
1 - P1
Mathematical expression χ B = ——————
P0
1
29.(i) Because oxygen forms multiple bonds with transition metals but fluorine does not form multiple bonds.
1
(ii) Cu has lower hydration enthalpy which is unable to compensate sum of first and second ionisation
enthalpy. 1
(iii) 4f electrons of lanthanides is less effectively shielded by nuclear charge than 5f electrons of actinides.
1
(iv) Because dichromate ions get reduced to chromium ions in acidic medium. 1
(v) The actinides show more number of oxidation states than lanthanides because in actinides 5f,6d and7s
levels have comparable energies. 1
OR
18. (i) Oxidation states of transition elements differ from each other by unity. In non transition elements
Oxidation states normally differ by a unit of two. ½+1/2
(ii) In transition elements higher oxidation states are favoured by heavier elements whereas in non transition
elements lower oxidation state is favoured by transition elements. ½+1/2
(b) i) 2MnO4
-
+ H2O + I-
——→ 2MnO2 +2OH-
+ IO3
- 1
Acid (pH less than 7)
(ii) 2CrO4
2-
+ 2H+
—————————→ Cr2O7
2-
+ H2O 1
←—————————
Alkali(pH more than 7)
Δ 513K
(iii)2 KMnO4 ———→ K2MnO4 + MnO2 + O2 1
30. (a) (i) Li AlH4/H3O+ 1/2
(ii) PCC 1/2
(iii) PCC 1/2
(iv) sodalime 1/2
(b) (i) Butanone < Propanone < Propanal < Ethanal < Methanal. 1
(ii) Acetone< Acetaldehyde< Formaldehyde. 1
(iii) Acetophenone< p- Tolualdehyde< Benzaldehyde<p-Nitro benzaldehyde. 1
OR
(a) (i)
19. 1
NMgBr C6H5
Ether ║ H3O+
|
(ii) CH3—CH2—CN + C6H5MgBr ———→ CH3CH2—C—C6H5 ——→C2H5—C=O 1
(b) (i) Because chloroacetate ion is more resonance stabilised than acetate ion due to the presence of electron
withdrawing chlorine atom (+I effect). 1
(ii) Due to the presence of extensive intermolecular hydrogen bonding in carboxylic acids than in alcohols
molecules.
1
(iii) Because of –I effect of nitro group stability of benzoate ion increases in 4-nitro benzoic acid.
But methoxy (+Ieffect) group decreases the stability of benzoate ion. 1