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Which amongst the following is not a greenhouse gas?

  • A.Carbon Dioxide
  • B.Methane
  • C.Carbon monoxide
  • D.Water vapours

Answer: C

Carbon monoxide is not a greenhouse gas. A greenhouse gas must absorb infrared radiation, which needs a molecule whose dipole moment changes as it vibrates.

Carbon monoxide absorbs very weakly and lasts only a few months in the atmosphere. Carbon dioxide, methane and water vapour are all effective greenhouse gases.

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