Question

$H_{2}S$ is less acidic than $H_{2}Te$. Why?

Answer 1

Acidity of $H_{2}S$ and $H_{2}Te$


In the oxygen family from $S\text{to}Te$ size of the atom increases, and ionization enthalpy and bond dissociation enthalpy decreases.

Hence, in case of $H_{2}Te$ removal of a hydrogen ion from this compound becomes easier due to less bond dissociation enthalpy, so acidity is higher.
So, $H_{2}S$ is less acidic than $H_{2}Te$.