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  4. Acidity of diprotic acids in aqueous solutions increases in the order

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Q. Acidity of diprotic acids in aqueous solutions increases in the order

AIPMTAIPMT 2014The p-Block Elements - Part2

Solution:

Acidic strength of hydrides increases as the size
of central atom increases which weakens the
M- H bond. Since, the size increases from S to Te
thus acidic strength follows the order.
$ H_2 S < H_2 S e < H_2 Te $
Acidic nature $ \propto \frac{1}{ Bond \, disspciation \, enthalpy } $
S to Te size increases, bond dissociation enthalpy
decreases and acidic nature increases.