Medium MCQ +4 / -1 PYQ · JEE Mains 2021

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 :

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

Solution

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

About this question

Subject: Chemistry · Chapter: Periodic Table and Periodicity · Topic: Periodic Trends

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