Verified Solution • 2025–26 Session moderate

QJEEM24Ch92a5: JEE Main 2024 Chemistry - Class 11 JEEM24Ch92a5 Solution: 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 : The first ionisation enthalpy decreases across a period.

Reason R : The increasing nuclear charge outweighs the shielding across the period.

In the light of the above statements, choose the most appropriate from the options given below :

Multiple Choice Options

  • A A is false but R is true
  • B Both A and R are true but R is NOT the correct explanation of A
  • C Both A and R are true and R is the correct explanation of A
  • D A is true but R is false

Step-by-Step Verified Solution

First ionisation energy increases along the period. Along the period Z increases which outweighs the shielding effect.

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