NEET-XII-Chemistry
Previous Year Paper year:2017
- #56Which is the correct thermal stability order
for ``H_2E ``(E = O, S, Se, Te and Po)?
(1)`` H_2S < H_2O < H_2Se < H_2Te < H_2Po``
(2)`` H_2O < H_2S < H_2Se < H_2Te < H_2Po``
(3)`` H_2Po < H_2Te < H_2Se < H_2S < H_2O``
(4) ``H_2Se < H_2Te < H_2Po < H_2O < H_2S``digAnsr: 3Ans : ( 3 )
Sol. On going down the group thermal stability
order for H
2
E decreases because H-E bond
energy decreases
∴ Order of stability would be:-
H
2
Po < H
2
Te < H
2
Se < H
2
S < H
2
O