Which of the following statements are correct in respect of greenhouse gases?

1.They are generally of light green colour.

2.They absorb thermal radiation emitted by the earth.

3.Water vapour is a greenhouse gas.

4.Greenhouse gases cause global warming.

5.Ammonia is a greenhouse gas.

A1, 2, 3 & 4 only

B1, 3 & 5 only

C2, 3 & 4 only ✓ Correct

D1, 2, 4 & 5 only

Correct answer: (C) 2, 3 & 4 only

Explanation

Greenhouse gases absorb the earth's thermal radiation, cause global warming, and include water vapour.

Statement 1 is wrong, as greenhouse gases have no characteristic green colour.

Statement 2 is correct, since they absorb infrared radiation emitted by the earth.

Statement 3 is correct, as water vapour is the most abundant greenhouse gas.

Statement 4 is correct, since trapped heat drives global warming.

Statement 5 is wrong, as ammonia is not a significant greenhouse gas.

Carbon dioxide, methane and nitrous oxide are the main long-lived greenhouse gases.

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