CBSE Class 12 Chemistry Question Paper 2019 Set 05 Solved

CBSE Class 12 Chemistry Question Paper Solved 2019 Set E. 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. Out of KCl and AgCl, which one shows Schottky defect and why ?

OR

Why does ZnO appear yellow on heating ?

2. Arrange the following in decreasing order of basic character :

C₆H₅NH₂, (CH₃)₃N, C₂H₅NH₂

3. What type of colloid is formed when a solid is dispersed in a liquid ? Give an example.

4. Out of Chlorobenzene and Cyclohexyl chloride, which one is more reactive towards nucleophilic substitution reaction and why ?

5. What is the basic structural difference between starch and cellulose ?

OR

Write the products obtained after hydrolysis of DNA.

SECTION B

6. Write balanced chemical equations for the following processes :

(a) Cl₂ is passed through slaked lime.

(b) SO₂ gas is passed through an aqueous solution of Fe(III) salt.

OR

(a) Write two poisonous gases prepared from chlorine gas.

(b) Why does Cu²⁺ solution give blue colour on reaction with ammonia ?

7. Give reasons :

(a) Cooking is faster in pressure cooker than in cooking pan.

(b) Red Blood Cells (RBC) shrink when placed in saline water but swell in distilled water.

8. When FeCr₂O₄ is fused with Na₂CO₃ in the presence of air it gives a yellow solution of compound(A).Compound (A) on acidification gives compound (B). Compound (B) on reaction with KCl forms an orange coloured compound (C). An acidified solution of compound (C) oxidises Na₂SO₃ to (D). Identify (A), (B), (C) and (D). 

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