Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) Electronic Configuration and Physical Properties of Alkali Metals Single Correct MCQ
Published on: August 12, 2026

The ionic mobility of alkali metal ions in aqueous solution is maximum for :

A
K +
B
Rb +
C
Li +
D
Na +

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Text Solution

Verified by Experts
The correct answer is:
B

M + + nH 2 O → [ M (aq) ] +

hydrated cation

The extent of hydration depends upon the size of the ion, smaller the size of the ion, more highly it is hydrated and thus move slowly because of bigger size of hydrated ions. Hence with bigger atomic size the mobility of hydrated ion is highest and the order of the ionic mobility is, Li + < Na + < K + < Rb + .

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