Question

Assertion (A): The greenhouse effect is exacerbated by the presence of nitrogen oxides and sulphur oxides in the atmosphere, intensifying the absorption of heat and contributing to global warming.

Reason (R): Oxides of nitrogen and sulphur, primarily released through industrial activities and combustion processes, amplify the greenhouse effect by enhancing the heat-trapping capacities of the atmosphere, leading to an increase in the average global temperatures.

1. A is True and R is False.
2. A is False and R is True.
3. Both A and R are True.
4. Both A and R are False.

Options

• (1)

• (2)

• (3)

• (4)

Answer 1

(4)

Explanation:

The greenhouse effect is mainly caused by greenhouse gases such as carbon dioxide, methane, nitrous oxide, water vapour, ozone and CFCs. Sulphur oxides and common nitrogen oxides such as NO and NO₂ are mainly associated with air pollution and acid rain, rather than being major heat-trapping greenhouse gases. Therefore, the Assertion (A) is false.

Oxides of sulphur and nitrogen released from industries and combustion processes do contribute to air pollution, but they do not generally intensify the greenhouse effect in the manner stated. Therefore, the Reason (R) is also false.

Hence, both A and R are false.