Acidity of diprotic acids in aqueous solutions increases in the order:

33 2014 AIPMT The p-Block ElementsHydrides of group 16 Easy
Acidity of diprotic acids in aqueous solutions increases in the order:
A $H_2S < H_2Se < H_2Te$
B $H_2Se < H_2S < H_2Te$
C $H_2Te < H_2S < H_2Se$
D $H_2Se < H_2Te < H_2S$

Detailed Solution

On moving down the group the bond length increases, so the H–E bond breaks more easily and the tendency to release $H^+$ increases.
So acidity: $H_2S < H_2Se < H_2Te$

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