CBSE - XII Chemistry 2007 Question Paper

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Chemistry (Theory)

Time allowed : 3 hours

Maximum Marks : 70

General Instructions :

All questions are compulsory.
Marks for each question are indicated against it.
Question number 1 to 5 are very short-answer questions, carrying 1 mark each.Answer these in one word or about one sentence each.
Question number 6 to 12 are short-answer questions, carrying 2 marks each. Answer these in about 30 wordseach.
Question number 13 to 24 are short-answer questicms of 3 marks each.Answer these in about 40 words each.
Question number 25 to 27are long-answer questions of 5 marks each. Answer these in about 70 words each.
Use Log Tables, if necessary. Use of calculators is not permitte

What is the number of atoms per unit cell in a body centered cubic structure ?
Define osmotic pressure.
For the reaction

$Cl_2(g)+2NO(g) \rightarrow 2NOCl(g)$

the rate law is expressed as

What is the overall order 'of this reaction ?
Write the IUPAC name of the compound:
Why do nitro compounds have high boiling points in comparison with other compounds of same molecular mass ?
State 'Pauli's exclusion principle'. Explain giving an example how this principle limits the maximum occupancy of an energy level in an atom.

OR

State 'Aufbau principle' and give the order in which the energies of orbitals increase and hence they are filled in that order.
A reaction with $\Delta _r G^{\ominus}$ < 0 always has an equilibrium constant value greater than 1. Why ?
Write balanced chemical equations for the following reactions

(i) Aluminium dissolves in aqueous hydrochloric acid

(ii) Tin reacts with a hot alkali solution
Write the structures of the following species:

(i)

(ii)

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