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Which of the gas is not known as green house gas?

Answer & Solution
Correct Answer: Option D
Greenhouse gases include: Water vapour (H2O), Carbon dioxide (CO2), Methane (CH4), Nitrous oxide (N2O), Ozone (O3), and Fluorinated gases such as CFCs, HFCs, PFCs, and SF6.

Hydrogen (H2) is not a greenhouse gas because it has no permanent electric dipole moment and therefore does not absorb infrared (IR) radiation effectively. The greenhouse effect occurs when gases absorb and re-emit infrared radiation emitted by Earth’s surface. Since hydrogen cannot interact with IR radiation in this way, it does not contribute to atmospheric warming.

Furthermore, hydrogen is a very light gas that tends to escape into the upper atmosphere, preventing its accumulation in significant amounts to influence Earth’s temperature.
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3 Comments
Sonu Singh
Sonu Singh 7 years ago
Opt B is right.
Kartheek Chakri
Kartheek Chakri 7 years ago
Is water vapour green house gass
ChandraKiran Mehta
ChandraKiran Mehta 8 years ago
But water vapour ? It is made up of hydrogen ,and ch4