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Pratap Surwase
Pratap Surwase

This document is a chemistry unit test with 25 marks divided into 4 sections. Section A contains 3 multiple choice questions about crystal lattice coordination, colligative properties, and cobalt ion oxidation states. Section B contains 4 short answer questions about bidentate ligands, Wurtz-Fittig reaction, body centered cubic crystal lattice cells, and hypotonic solutions. Section C gives 2 long answer questions to derive relationships between electrolyte dissociation and Van't Hoff factor or explain the formation and properties of the cobalt(III) hexammonia complex. Section D asks to explain the SN2 reaction mechanism or classify and describe ligands.

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12th HSC UNIT TEST NAME OF EXAMINATION – UNIT TEST 1 MARKS - 25 SUBJECT – CHEMISTRY SECTION – A Q.1. Select and write the correct answer for the following multiple choice type of questions [ 3 ] 1) The coordination number of atoms in bcc crystal lattice is ____. a) 2 b) 4 c) 6 d) 8 2) The colligative property of the solution is____. a) Vapour pressure b) Boiling point c) Osmotic pressure d) Freezing point 3) The oxidation state of cobalt ion in the complex [Co(NH3)5Br]SO4 is_____. a) +2 b) +3 c) +1 d) +4 Q.2. Answer the following questions : [ 4 ] 1) What are bidentate ligands ? 2) What is wurtz-fittig reaction ? 3) How many cells will be there in bcc crystal lattice ? 4) Define hypotonic solution. SECTION – B Q.3 Attempt any four of the following questions : [ 8 ] 1) Derive the relationship between molar mass, density and edge length of unit cell. 2) Distinguish between ionic solids and molecular solids.
3) State and explain Henry’s law. 4) Draw cis-trans isomers of [Pt(NH3)4ClBr]2+ . 5) What is double salt? Give one example. 6) How will you prepare 1-bromo-1-methylcyclohexane from alkene? SECTION – C Attempt any two of the following : [ 6 ] Q.4. Derive the relationship between degree of dissociation of an electrolyte and Van’t Hoff factor. Q.5. Explain formation of [Co(NH3)6] 3+ complex with respect to – a) Hybridisation b) Magnetic properties c) Inner/outer complex d) Geometry Q.6. Explain SN2 reaction mechanism with example. SECTION – D Attempt any one of the following. [ 4 ] Q.7. What are ligands? How are they classified? Q.8. Convert the following – a) Bromobenzene to toluene. b) Alcohol to alkyl halide. c) chlorobenzene to 1-chlorotoluene d) Ethyl bromide to butane.

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Ummmmmmmmmmmmmmmvmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm

  • 1. 12th HSC UNIT TEST NAME OF EXAMINATION – UNIT TEST 1 MARKS - 25 SUBJECT – CHEMISTRY SECTION – A Q.1. Select and write the correct answer for the following multiple choice type of questions [ 3 ] 1) The coordination number of atoms in bcc crystal lattice is ____. a) 2 b) 4 c) 6 d) 8 2) The colligative property of the solution is____. a) Vapour pressure b) Boiling point c) Osmotic pressure d) Freezing point 3) The oxidation state of cobalt ion in the complex [Co(NH3)5Br]SO4 is_____. a) +2 b) +3 c) +1 d) +4 Q.2. Answer the following questions : [ 4 ] 1) What are bidentate ligands ? 2) What is wurtz-fittig reaction ? 3) How many cells will be there in bcc crystal lattice ? 4) Define hypotonic solution. SECTION – B Q.3 Attempt any four of the following questions : [ 8 ] 1) Derive the relationship between molar mass, density and edge length of unit cell. 2) Distinguish between ionic solids and molecular solids.
  • 2. 3) State and explain Henry’s law. 4) Draw cis-trans isomers of [Pt(NH3)4ClBr]2+ . 5) What is double salt? Give one example. 6) How will you prepare 1-bromo-1-methylcyclohexane from alkene? SECTION – C Attempt any two of the following : [ 6 ] Q.4. Derive the relationship between degree of dissociation of an electrolyte and Van’t Hoff factor. Q.5. Explain formation of [Co(NH3)6] 3+ complex with respect to – a) Hybridisation b) Magnetic properties c) Inner/outer complex d) Geometry Q.6. Explain SN2 reaction mechanism with example. SECTION – D Attempt any one of the following. [ 4 ] Q.7. What are ligands? How are they classified? Q.8. Convert the following – a) Bromobenzene to toluene. b) Alcohol to alkyl halide. c) chlorobenzene to 1-chlorotoluene d) Ethyl bromide to butane.