Why is `H_(2)S` less acidic than `H_(2)Te` ?

Explanation

As the size of the element increases down the group, E-H bond length increases and hence E-H bond dissociation energy decreases. In other words, H-S bond dissociation energy is higher than that of H-Te bond dissociation energy and hence H-S bond breaks less easily than H-Te bond. Therefore, `H_(2)S` is a weaker acid than `H_(2)Te`.