CBSE Class 12 Chemistry Question Paper Solved 2019 Set F

CBSE Class 12 Chemistry Question Paper Solved 2019 Set F. 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. What is the basic structural difference between starch and cellulose ?

OR

Write the products obtained after hydrolysis of DNA.

2. Arrange the following in increasing order of pKb values :

C₆H₅CH₂NH₂, C₆H₅NHCH₃, C₆H₅NH₂

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

4. Out of Chlorobenzene and p-nitrochlorobenzene, which one is more reactive towards nucleophilic substitution reaction and why ?

5. Out of KCl and AgCl, which one shows Schottky defect and why ?

OR

Why does ZnO appear yellow on heating ?

SECTION B

6. 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).

7. Give reasons :

(a) A decrease in temperature is observed on mixing ethanol and acetone.

(b) Potassium chloride solution freezes at a lower temperature than water.

8. 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. 

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