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JEE Main levelSingle correct optionDifficulty 2 of 3ev080

Increasing the concentration of warms the lower atmosphere because

  1. Aincreases the amount of UV reaching the ground
  2. Breacts with ozone to form heat-trapping carbon monoxide
  3. Cabsorbs outgoing infrared and re-radiates part of it back towards the surface
  4. Dreflects incoming visible light into space

Answer: C

The molecule absorbs the Earth's infrared emission and emits it in all directions, so a share returns downward. This slows the escape of heat to space.
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