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

Answer 1

Answer: (B)

From left to right in periodic table :-
Metallic character decreases
Non-metallic character increases
$\Rightarrow $ It is due to increase in ionization enthalpy and increase in electron gain enthalpy.