Question

Which of the following is not a greenhouse gas?
A. Carbon dioxide
B. Water vapour
C. Oxygen
D. Methane

Answer 1

Hint:The greenhouse gases are gases which absorb the harmful radiation emitted by the sun and does not allow it to reflect back into the atmosphere. The greenhouse gases contain more than two atoms.

Complete step by step answer:
The greenhouse effect is defined as a technique employed to insulate the earth surface and protect it from harmful radiation of the sun. In this process, the greenhouse gases present in the greenhouse absorbs the harmful radiation emitted by the sun and does not allow it to reflect back.
During the day time, the heat emitted by the sun warms up the earth surface and at night, the earth is cooled and the heat is emitted back to the atmosphere. During this process, the heat is absorbed and trapped by the greenhouse gases. This helps to make the earth warmer and make the survival of human beings possible.
The major causes of greenhouse effect are burning of fossil fuels, deforestation, farming, and industrial waste.
The greenhouse gases are defined as those gases which absorb the infrared radiation emitted by the sun and are responsible for the formation of greenhouse effect.
The naturally occurring greenhouse gases are carbon dioxide, water vapour and methane. Oxygen is not a greenhouse gas.
Therefore, the correct option is C.

Note:
There are harmful effects due to the increased concentration of greenhouse gases. The increase in greenhouse gases results in global warming, depletion in ozone layer, air pollution, and acidification of water bodies.