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