Home Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) Alkali Metals The order of decreasing ionisation enthalpy …
Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) Alkali Metals Single Correct MCQ
Published on: August 12, 2026

The order of decreasing ionisation enthalpy in alkali metals is.

A
Na > Li > K > Rb
B
Rb < Na < K < Li
C
Li > Na > K > Rb
D
K < Li < Na < Rb

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Text Solution

Verified by Experts
The correct answer is:
C

Ionisation enthalpy of alkali metals decreases down the group from Li to Cs. This is because of increases in size which outweighs the increasing nuclear charge, and the outermost electron is very well screened from the nuclear charge.

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