Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main 202131 AugustMorning Shift
Exam
JEE Main
Year
2021
Date
31 August
Shift
Morning Shift
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

JEE Main 2021 · 31 August · Morning Shift · Chemistry · Classification of Elements and Periodicity in Properties

Given below are two statements : one is labelled as Assertion (A)...

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 :

Options

  1. A(A) is false but (R)\left(R\right) is true.
  2. BBoth (A)\left(A\right) and (R)\left(R\right) are correct and (R)\left(R\right) is the correct explanation of (A)\left(A\right)
  3. CBoth (A)\left(A\right) and \left(R\right)arecorrectbut(R)are correct but \left(R\right) is not the correct explanation of \left(A\right).
  4. D(A)\left(A\right) is true but (R)\left(R\right) is false.

Correct answer

D. (A)\left(A\right) is true but (R)\left(R\right) 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.
Practice Classification of Elements and Periodicity in Properties on Quantrex Academy →

More from Classification of Elements and Periodicity in Properties

The correct statement(s) regarding the periodic properties of elements is(are) JEE Advanced 2026Match List-I with List-II. List-I Electronic configuration of neutral atom (where n=2 )… JEE Main 2026In a period, the first ionisation enthalpy of the element at extreme left and the… JEE Main 2026Given below are two statements: Statement I: Aluminium is more electropositive than… JEE Main 2026Given below are two statements : Statement I: The number of pairs among [Al_2O_3… JEE Main 2026Given below are two statements: Statement I: The correct order of electronegativity of… JEE Main 2026The 1^ st ionization enthalpy for Mg is +737 kJ/mol. The most probable estimated value of… JEE Main 2026The electronegativity of a group 13 element 'E' is same as that of Ge (on Pauling scale… JEE Main 2026 Full Classification of Elements and Periodicity in Properties list All JEE Main PYQs