Question

Incomplete combustion of coal and petroleum : (A) increases air pollution. (B) increases efficiency of machines. (C) reduces global warming. (D) produce poisonous gases. The correct option is ?

• A. (A) and (B)
• B. (A) and (D)
• C. (B) and (C)
• D. (C) and (D)

Answer 1

The correct option is B

(A) and (D)

Explanation for the Correct Option:

Option(B):

• The incomplete combustion of fuels mainly leads to the production of a gas called Carbon monoxide$\left(\mathrm{CO}\right)$ which is an extremely toxic and highly poisonous gas.
• Coal and petroleum fuels contain carbon molecules hence, on incomplete combustion, they react with atmospheric oxygen and form a harmful gas called Carbon monoxide.
• Also, incomplete combustion of coal and petroleum fuels leads to increased air pollution.

Explanation for the incorrect options:

Option(A):

• The incomplete combustion of coal and petroleum does not increase the efficiency of machines.
• Hence as one of the given option options does not match the correct concept, the option given is an incorrect one.

Option(C):

• The incomplete combustion of coal and petroleum does not help in reducing global warming and does not increase the efficiency of machines.
• Hence, the given option is an incorrect one.

Option(D):

• The incomplete combustion of coal and petroleum does not help in reducing global warming.
• Thus as one of the given option options does not coincide with the correct concept, the option given is an incorrect one.

Hence, option (B) is the correct answer. The incomplete combustion of coal and petroleum (A) increases air pollution and (D) produces poisonous gases.