CBSE Class 12 Chemistry 2017 Sample Paper

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Sample question paper for class 12 Chemistry

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Question No.

Question

Marks

1

Define Kraft temperature.

1

2

The electronic configuration of a transition element in +3 oxidation state is [Ar] 3d⁷. Find out its atomic number.

1

3

Draw the structure of 4-tertbutyl-3-iodoheptane.

1

4

Give the equation of reaction for the preparation of phenol from cumene.

1

5

Name the type of semiconductor obtained when silicon is doped with boron.

1

6

The two complexes of nickel, [Ni(CN)₄]^2- and [Ni(CO)₄], have different structures but possess same magnetic behaviour. Explain.

OR

A chloride of fourth group cation in qualitative analysis gives a green coloured complex [A] in aqueous solution which when treated with ethane –1, 2 – diamine (en) gives pale - yellow solution [B] which on subsequent addition of ethane –1, 2 – diamine turns to blue/purple [C] and finally to violet [D]. Write the structures of complexes [A], [B], [C] and [D].

2

7

Account for the following :

(i) XeF2 is linear molecule without a bend.

(ii) The electron gain enthalpy with negative sign for fluorine is less than that of chlorine, still fluorine is a stronger oxidizing agent than chlorine.

2

8

Derive the relationship between relative lowering of vapour pressure and mole fraction of the volatile liquid.

2

9

After 24 hrs, only 0.125 gm out of the initial quantity of 1 gm of a radioactive isotope remains behind. What is its half life period?

2

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Complete sample paper for class 12 Chemistry 2017