A) Water vapour
B) Ozone
C) Oxygen
D) Nitrogen
Correct Answer: A
Solution :
A greenhouse gas is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range, the fundamental cause of the greenhouse effect. Among the greenhouse gases, water vapour and clouds contribute 36-72% of the greenhouse effect. Carbon dioxide (9 - 26%). Methane (4 - 9%) and Ozone (3 - 7%) come next.| Compound | Formula | Concentration in atmosphere (ppm) | Contribution (%) |
| Water vapour and clouds | \[{{H}_{2}}O\] | 10 - 15,000 | 36 - 72% |
| Carbon dioxide | \[C{{O}_{2}}\] | ~400 | 9 - 26% |
| Methane | \[C{{H}_{4}}\] | ~1.8 | 4 - 9% |
| Ozone | \[{{O}_{3}}\] | \[2-{{8}^{(B)}}\] | 3 - 7% |
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