JEE Main levelSingle correct optionDifficulty 2 of 3ev083
Assertion (A): Although CO2 traps less heat per molecule than a CFC molecule, CO2 is responsible for the larger part of the enhanced greenhouse effect.
Reason (R): The atmospheric amount of CO2 added by human activity is vastly greater than that of CFCs.
ABoth A and R are true and R is the correct explanation of A
BBoth A and R are true but R is not the correct explanation of A
CA is true but R is false
DA is false but R is true
Answer: A
A CFC molecule absorbs infrared much more effectively than a CO2 molecule, but CFCs are present in tiny quantities. The overall contribution depends on both effectiveness and amount, so R explains A.