Arrange the following gases in ascending order of their Global Warming Potential (GWP). Choose the correct answer from the options given below.

1.CO2

2.CH4

3.SF6

4.CFC-11

5.N2O

A1, 2, 3, 5, 4

B1, 2, 5, 4, 3 ✓ Correct

C2, 3, 1, 5, 4

D1, 5, 2, 4, 3

Correct answer: (B) 1, 2, 5, 4, 3

Explanation

In rising order of global warming potential the sequence runs carbon dioxide, methane, nitrous oxide, CFC-11 and then sulphur hexafluoride.

Carbon dioxide is the reference gas with a global warming potential of one, so it comes first.

Methane traps far more heat per unit mass than carbon dioxide, placing it next.

Nitrous oxide is stronger still over a century, coming after methane.

CFC-11 has a much higher potential than nitrous oxide.

Sulphur hexafluoride has by far the greatest potential of the group, so it ranks last.

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