What is the number of gases that qualify as a greenhouse gas out of the following is?

$CO,NO, N 2 O, CH 4,Cl 2,H 2$

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answer is A.

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Detailed Solution

concept - Greenhouse gases trap infrared radiation coming from the Sun and prevent it from escaping into space. They re-radiate it back into Earth's atmosphere. They lead to an increase in the temperature of the atmosphere.
Carbon dioxide (

CO 2

), methane (

CH 4

), nitrous oxide (

N 2 O

), ozone (

O 3

) and chlorofluorocarbons (CFCs) along with water vapour are known as greenhouse gases.
As a result of human intervention, the amount of greenhouse gases in the atmosphere has increased significantly, causing the greenhouse effect
Energy coming from the Sun is either reflected, transmitted, or captured by the Earth's atmosphere. Greenhouse gases trap the energy in the infrared region, and thus, raise the temperature.
Greenhouse gases, even when present in trace amounts in the atmosphere, cause a significant greenhouse effect.
The main greenhouse gases are:
Carbon dioxide, Water steam, Methane, Ozone, Nitrous oxide, and Chlorofluorocarbons
Hence, the number of greenhouse gases is 2, they are