Ncert Exercises & Solutions

Given below are two statements:

Assertion (A):	Electron gain enthalpy becomes less negative as we go down a group.
Reason (R):	The size of the atom increases on going down the group and the added electron would be farther from the nucleus.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	(A) is false but (R) is true.

Hint: Electron gain enthalpy becomes less negative as we go down a group.

Electron gain enthalpy becomes less negative as the size of an atom increases down the group. This is because within a group screening effect increases ongoing downward and the added electron would be farther away from the nucleus.

Hence, Assertion and reason both are correct statements and reason is the correct explanation for assertion.

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