CBSE Class 12 Chemistry Question Paper Solved 2019 Set N

CBSE Class 12 Chemistry Question Paper Solved 2019 Set N. Students can download the last year board exams question papers using the link below. Free download of examination question papers with solutions. Last 10 year question papers should be practised to get better marks in examinations.

SECTION A

1. A cube solid is made up of two elements A and B. Element A forms ccp while atoms of element B occupy one-third of the tetrahedral voids. What is the formula of the solid ?

2. How will you prepare arsenic sulphide sol in the lab ?

OR

Give an example of heterogeneous catalysis.

3. CH₃CHO is more reactive than CH₃COCH₃ towards reaction with HCN. Why ?

4. What are the products of exhaustive ammonolysis of an alkyl halide ?

5. What type of isomerism is shown by complex [Co(NH₃)5Cl]SO₄ ?

OR

Arrange the following in increasing order of crystal field splitting energy :

[Cr(CN)6]^3–, [Cr(NH3)6]³⁺, [CrCl6]^3–

6. Show that for a first order reaction, time required for completion of 99% of reaction is twice the time required for completion of 90% of reaction.

7. Arrange the hydrides of group 16 in order of increasing boiling points, giving reason. Name the hydride which is most stable thermodynamically.

8. How is KMnO₄ prepared from pyrolusite ? Give steps involved with equations.

9. An aromatic compound ‘A’ on treatment with CHCl₃ and KOH gives two compounds, both of which give same product ‘B’ when distilled with Zinc dust. Oxidation of ‘B’ gives ‘C’ with molecular formula C₇H₆O₂. Sodium salt of ‘C’ on heating with soda lime gives ‘D’ which may also be obtained by distilling ‘A’ with Zinc dust. Identify ‘A’, ‘B’, ‘C’ and ‘D’.

OR

How do you convert the following :

(a) Phenol to Toluene

(b) Ethanol to Ethanal

10. What happens when D-glucose is treated with the following ? Give equations to support your answer.

(a) HI

(b) HNO₃

OR

Give any two points of difference between globular and fibrous proteins. 

11. Write two differences between DNA and RNA.

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