1.

Acidity of diprotic acids in aqueous solutions increases in the order

Answer»

`H_(2)S lt H_(2)Se lt H_(2)Te`
`H_(2)Se lt H_(2)S lt H_(2)Te`
`H_(2)Te lt H_(2)S lt H_(2)Se`
`H_(2)Se lt H_(2)Te lt H_(2)S`

Solution :As the SIZE of the element (X) increases, the bond length of the H-X bond increases and its bond strength decreases. In other WORDS, tendency of the H-X bond to dissociate to give `H^(+)` ions increases and hence ACIDITY increases in the ORDER :
`H_(2)Slt H_(2)Se lt H_(2)Te`.


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