Question

Incomplete combustion of coal and petroleum:

1. increases air pollution.
2. increases the efficiency of machines.
3. reduces global warming.
4. produce poisonous gases.

The correct option is:

Options

• (A) and (B)

• (A) and (D)

• (B) and (C)

• (C) and (D)

Answer 1

(A) and (D)

Explanation:

Incomplete combustion occurs when there is an insufficient supply of oxygen. This leads to the following outcomes:

1. Air Pollution (A): Instead of just water vapour and carbon dioxide, it releases soot (unburnt carbon particles) and smoke, which significantly pollute the air.
2. Poisonous Gases (D): It produces Carbon Monoxide (CO), a highly toxic gas that binds to haemoglobin in the blood, preventing oxygen transport.