The statements that are TRUE:
(A) Methane leads to both global warming and photochemical smog.
(B) Methane is generated from paddy fields.
(C) Methane is a stronger global warming gas than .
(D) Methane is a part of reducing smog.
Choose the most appropriate answer from the options given below:
(A) Methane leads to both global warming and photochemical smog.
(B) Methane is generated from paddy fields.
(C) Methane is a stronger global warming gas than .
(D) Methane is a part of reducing smog.
Choose the most appropriate answer from the options given below:
- (A)(A), (B), (C) only✓ Correct
- (B)(A) and (B) only
- (C)(A), (B), (D) only
- (D)(B), (C), (D) only
Answer: (A)
Solution
Waterlogged paddy fields are anaerobic, and methanogenic bacteria working in them release methane, so its generation there is correct. Molecule for molecule methane absorbs infrared radiation far more strongly than , which makes it the stronger global warming gas. Being a hydrocarbon, it also enters the radical chain that builds up ozone and other oxidants in sunlight, so it feeds photochemical smog as well as warming. Reducing smog is the classical mixture of sulphur dioxide, smoke and fog formed in cool humid air, and methane is no part of it. The true statements are that methane leads to both global warming and photochemical smog, that it is generated from paddy fields, and that it is a stronger global warming gas than carbon dioxide.
JEE Main · 2021 · 18 Mar 2021 · Shift 1 · Single correct option