Question

H₂S is less acidic that H₂Te, why?

Answer 1

your answer ↓

When we move down the group the tendency of breaking up of bonds become easy that is it is easy to break or dissociate a bond with this fact we can conclude that in h2te the h(positive ion can be removed easily)

Answer 2

Lewis acid -base theory also called as H2S acidic when compared to PH3.

H2 S have the tendency with the lose H+.

P3 basics have the best nature with the lone pair of electron so it has tendency to lose pair of electron.

Order of electronegativities of third period is as follows:

P < S The acidic strength of their hydrides will be PH3 < H2 S.