Question

Greenhouse gases are those that can absorb and emit infrared radiation. Which of the following is not a greenhouse gas?
A. Water vapour
B. Carbon dioxide
C. Methane
D. Hydrogen

Answer 1

Gases that are present in the atmosphere and can absorb and emit the radiation are called greenhouse gases. These gases are responsible for trapping the heat of the earth, thereby causing a greenhouse effect. Greenhouse effect leads to global warming that is increasing the earth’s temperature.

Complete answer:
Greenhouse gases are the atmospheric gases that are capable of absorbing and emit infrared radiations. These gases absorb infrared radiation and emit that in the form of heat. This causes a greenhouse effect. Greenhouse effect is due to the greenhouse gases trapping the radiations in the form of heat on the earth’s surface.
The gases like water vapours, carbon dioxide, methane, nitrous oxide, ozone are present in the atmosphere and act as greenhouse gases.
Hence, hydrogen gas is not considered as a greenhouse gas as it does not absorb or emit infrared radiations.

So, option D is correct.

Note:
Greenhouse gases are responsible for the greenhouse effect. This effect causes the temperature of the earth to rise and the earth heats up causing global warming. Global warming leads to climate change and other phenomena like melting of glaciers that is harmful for the sustenance of life on the earth. Therefore greenhouse gases are considered as harmful gases. Ozone is the gas that is helpful in absorbing harmful UV radiations of the sun, preventing them from reaching the earth’s surface.