Acidity of diprotic acids in aqueous solutions increases in the order (CBSE AIPMT 2014)

Acidic strength of hydrides increases as the size of central atom increases which weakens the M–H bond. Since, the size increase from S to Te, thus acidic strength follows the order: H₂S < H₂Se < H₂Te or as we go down the group, acidic strength of hydride increases.