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Chemistry
Which is the correct thermal stability order for H2E (E = O. S. Se. Te and Po) ?
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Q. Which is the correct thermal stability order for $H_2E$ (E = O. S. Se. Te and $Po$) ?
NEET
NEET 2019
The p-Block Elements - Part2
A
$H_2Po < H_2Te< H_2Se < H_2S < H_2O$
51%
B
$H_2Se < H_2Te< H_2Po < H_2O < H_2S$
12%
C
$H_2S < H_2O < H_2Se < H_2Te< H_2 Po$
15%
D
$H_2O < H_2S < H_2Se < H_2Te < H_2Po$
21%
Solution:
On going down the group thermal stability order for $H_2 E$ decreases because H-E bond energy decreases
$\therefore $ Order of stability would be:-
$H_2 Po < H_2 Te < H_2 Se < H_2S < H_2 O$