Question

12. 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

Answer:

Answer is A. Increase air pollution and D. Produce poisonous gas

Means:- (A) and (D) is the right answer.

Hope it will help you...

Answer 2

Incomplete combustion of coal and petroleum causes:

(b) (A) and (D)

• Incomplete combustion refers to a combustion reaction that occurs without a sufficient supply of oxygen.

• Incomplete combustion of coal and petroleum releases quantities of soot and poisonous gases like carbon monoxide which are chief causes of global warming.

• Air pollution is also increased by the incomplete combustion of fossil fuels like coal and petroleum.