Given below are two statements: one is labelled as

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 $(\mathbf{R}):$ 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:

 

  1. (A) is false but $(\mathbf{R})$ is true.

     

  2. (A) is true but (R) is false

  3. Both $(\mathbf{A})$ and $(\mathbf{R})$ are correct and $(\mathbf{R})$ is the correct explanation of (A)

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

Correct Option: , 2

Solution:

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.

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