Question

Arrange the following
$H_{2}S,H_{2}O,H_{2}Se,H_{2}Te$ in order of increasing acidity.

Answer 1

Because of decrease in bond dissociation enthalpy, acidity of hydrides increases down the group.
Increasing order of acidity is : $H_{2}O<H_{2}S<H_{2}Se<H_{2}Te$