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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.