objective questions set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

The order of appearance of the following with increasing temperature during the refining of crude oil is _____________ .

a) Gasoline, kerosene, diesel

b) Kerosene, gasoline, diesel

c) Diesel, gasoline, kerosene

d) Gasoline, diesel, kerosene

Question : 2

The characteristic odour of garlic is due to

a) a sulphur compound

b) a fluorine compound

c) a chloro compound

d) acetic acid

Question : 3

Assertion (A) :
The main constituent of the liquefied petroleum gas is methane.
Reason (R) :
Methane can be used directly for burning in homes and factories where it can be supplied through pipelines.

a) Both A and R are true but R is not the correct explanation of A

b) A is true but R is false

c) Both A and R are true and R is the correct explanation of A

d) A is false but R is true

Question : 4

Gas welding used for welding broken pieces of iron, we normally use a mixture of :

a) ethene and oxygen

b) ethyne and oxygen

c) ethane and oxygen

d) ethene and air

Question : 5

Match List-I with List-II :

a) A – 4, B – 3, C – 1, D – 2

b) A – 5, B – 1, C – 2, D – 3

c) A – 5, B – 1, C – 3, D – 2

d) A – 4, B – 3, C – 1, D – 2

Question : 6

Which of the following has shortest carbon-carbon bond length?

a) C₂H₄

b) C₂H₆

c) C₂H₂

d) C₆H₆