p-Block elementsHard

Question

The thermal stability of hydrides of oxygen family is in order :

Options

A.H2Po < H2Te < H2Se < H2S < H2O
B.H2Po < H2O < H2Te < H2Se < H2S
C.H2S < H2O < H2Te < H2Se < H2Po
D.H2O < H2S < H2Te < H2Se < H2Po

Solution

Down the group bond (H − E) dissociation enthalpy decreases as (H − E) bond length increases and thus thermal stability of hydrides also decreases.

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