Question

Given below are two statements : one is labelled as
Assertion (A) and the other is labelled as
Reason (R).

Assertion (A) : Metallic character decreases and non-metallic character increases on moving from left to right in a period.

Reason (R) : It is due to increase in ionisation enthalpy and decrease in electron gain enthalpy, when one moves from left to right in a period.

In the light of the above statements, choose the most appropriate answer from the options given below :

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
• B. (A) is true but (R) is false
• C. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• D. (A) is false but (R) is true

Answer 1

The correct option is B (A) is true but (R) is false

Metallic character decreases on moving left to right and non-metallic character increases, it is due to increase in ionisation enthalpy. But electron gain enthalpy also increases from left to right.
Reason is not correct.
Hence, the correct option is (b)