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COMEDK2021PhysicsKinetic Theory of Gases

Which of the following is not a green house gas?

Options

  1. ACH ₄
  2. BCO ₂
  3. CN ₂
  4. DN₂O

Correct answer

C. N ₂

Step-by-step solution

The correct answer is (3) N₂ . N₂ makes up about 78% of the Earth's atmosphere but is not a greenhouse gas. Being a symmetrical diatomic molecule (two identical atoms), it does not absorb infrared radiation radiating from the Earth's surface. In contrast, CO₂ , CH₄ , and N₂O have asymmetric molecular structures that allow them to absorb and trap heat in the atmosphere.

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