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Which is the correct thermal stability order for H2E (E = O, S, Se, Te and Po)? 

(1) H2S < H2O < H2Se < H2Te < H2Po 

(2) H2O < H2S < H2Se < H2Te < H2Po 

(3) H2Po < H2Te < H2Se < H2S < H2

(4) H2Se < H2Te < H2Po < H2O < H2S

The p block elements, group 15 elements

1 Answer

Best answer

Ans : (3) H2Po < H2Te < H2Se < H2S < H2O

Explanation : 

On going down the group thermal stability order for H2E decreases,

because H-E H-E bond energy decreases.

Hence, order of stability would be

H2Po < H2Te < H2Se <H2S < H2O

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