Acidity of diprotic acids in aqueous solutions increases in the order

Options

A. `H_(2)S lt H_(2)Se lt H_(2)Te`
B. `H_(2)Se lt H_(2)S lt H_(2)Te`
C. `H_(2)Te lt H_(2)S lt H_(2)Se`
D. `H_(2)Se lt H_(2)Te lt H_(2)S`

Answer

A

Explanation

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