The mobilities of the alkali metal ions in aqueous solution are `Li^(+) lt Na^(+) lt K^(+) lt Rb^(+) lt Cs^(+) ` because

Options

A. greater is the degree of hydration, lesser is the mobility in aqueous aqueous medium
B. larger the size of cation, greater is the mobility in aqueous medium
C. larger the size of cation, lesser is the mobility of ions in aqueous medium
D. lesser the degree of hydration, lesser is the mobility of ions in aqueous medium

Answer

A

Explanation

Smaler the size of the ion, greater is the degree of hydration and hence lesser is the mobility in aqueous medium.