set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

Which one of the following sets of elements was primarily responsible for the origin of life on the Earth?

a) Oxygen, calcium, phosphorus

b) Hydrogen, oxygen, sodium

c) Carbon, hydrogen, nitrogen

d) Carbon, hydrogen, potassium

Question : 2

The main constituent of Vinegar is:

a) Ascorbic acid

b) Citric acid

c) Acetic acid

d) Tartaric acid

Question : 3

Mineral acids are stronger acids than carboxylic acids because

1. mineral acids are completely ionized
2. carboxylic acids are completely ionized
3. mineral acids are partially ionized
4. carboxylic acids are partially ionized

a) B and C

b) A and B

c) A and D

d) C and D

Question : 4

General formula of alkyne is

a) C_nH_2n–2

b) C_nH_2n

c) C_nH_2n+2

d) C_nH_n

Question : 5

Hydrogenation of oils involves

1. saturation of unsaturated fatty acids
2. reaction with hydrogen in presence of nickel
3. conversion into saturated fatty acids
4. driving off the impurities in oil by hydrogen gas

a) 2, 3 and 4

b) 1, 2 and 3

c) 1, 2 and 4

d) 1, 3 and 4

Question : 6

The functional group present in CH₃COOC₂H₅ is

a) ester

b) aldehydic

c) ketonic

d) carboxylic