Home Chemistry Classification of Elements and Periodicity Ionisation Energy Which of the following relation is correct w…
Chemistry Classification of Elements and Periodicity Ionisation Energy Single Correct MCQ
Published on: August 14, 2026

Which of the following relation is correct with respect to first (I) and second (II) ionization enthalpies of potassium and calcium ?

A
ICa> IIK
B
IK> Ica
C
IICa> IIK
D
IIK> IICa

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Text Solution

Verified by Experts
The correct answer is:
D

Second ionisation energy of sodium is greater than that of Mg. In case of sodium ion (i.e. Na+) the electron removal from the stable inert gas configuration (1s2 2s2 2p6) requires much higher energy.

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