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. - Competishun

JEE MAIN 2024

29-01-2024 S1

Question

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:

Select the correct option:

Both A and R are true and R is the correct explanation of A

A is true but R is false

A is false but R is true

Both A and R are true but R is NOT the correct explanation of A

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

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

Question Tags

JEE Main

Chemistry