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JEE Main202131 Aug 2021Morning ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

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

Options

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

Correct answer

D. A is true but R is false.

Step-by-step solution

It is due to increase in ionisation enthalpy and increases in electron gain enthalpy, when one moves from left to right in a period.

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