Question

Some gases are responsible for heating of atmosphere (green house effect). Identify from the following the gaseous species which does not cause it.

• A. \(CH_4\)
• B. \(O_3\)
• C. \(H_2O\)
• D. \(N_2\)

Answer 1

The Correct Option is D

The question is focused on identifying gases that contribute to the greenhouse effect. The greenhouse effect is the warming of Earth's surface due to the trapping of heat by certain gases in the atmosphere. Let's review the options given:

1. CH_4 (Methane): Methane is a well-known greenhouse gas that significantly contributes to the greenhouse effect. It traps heat in the atmosphere, more efficiently than carbon dioxide, although it is present in smaller quantities.
2. O_3 (Ozone): Ozone in the troposphere is considered a greenhouse gas. It traps heat and contributes to warming the atmosphere. However, it should be noted that ozone high up in the stratosphere plays a different role in absorbing harmful ultraviolet radiation.
3. H_2O (Water Vapor): Water vapor is the most abundant greenhouse gas in the atmosphere. It absorbs heat and re-emits infrared radiation, contributing significantly to the greenhouse effect.
4. N_2 (Nitrogen): Nitrogen makes up about 78% of Earth's atmosphere, but it is not considered a greenhouse gas. Nitrogen does not have the molecular structure needed to absorb infrared radiation and hence, does not contribute to the greenhouse effect.

Therefore, the correct answer to the question is N_2, as it does not contribute to the greenhouse effect unlike the other options listed.

In summary, gases like CH_4, O_3, and H_2O are involved in the greenhouse effect by trapping heat in the atmosphere, whereas N_2 does not have this capability.