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The most acidic and thermally stable hydride of chalcogens are respectively

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H₂O, H₂Te

H₂Te, H₂S

H₂Te, H₂O

H₂S, H₂Te

answer is D.

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Detailed Solution

1.As we move down the group, thermal stability decreases (because M-H bond energy decreases), so order is H₂Po<H₂Te<H₂Se<H₂S<H₂O

2.Among hydrides of chalcogens, is most acidic. It is because down the group, bond length increases, there it becomes easier to release , and hence it is most acidic. Among hydrides of chalcogens, is most stable. It is because, bond length is shortest among the hydrides of the same group, therefore difficult to break. So it is most stable.

The most acidic and thermally stable hydride of chalcogens are respectively H₂Te, H₂O

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