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Question

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

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

The correct option is A H2Po<H2Te<H2Se<H2S<H2O
On going down the group thermal stability order for H2E decreases because HE bond energy decreases.

Order of stability would be:-

H2Po<H2Te<H2Se<H2S<H2O

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