Assertion (A) : Electron gain enthalpy of O or F is less than that of the succeeding element in their respective groups.
Reason (R) : Electron gain enthalpy increases as we go down the group.

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Both A and R are correct and R is the correct explanation of A.

A is incorrect, R is correct.

A is correct, R is incorrect.

Both A and R are correct but R is not the correct explanation of A.

answer is C.

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Detailed Solution

Assertion: It is a fact that Electron gain enthalpy of O or F is less than that of the succeeding element in their respective groups. Reason: R is incorrect, the correct statement is Electron gain enthalpy decreases as we go down the group.

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