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Question

The correct order of thermal stability of hydrogen halides (H-X) is :

A
HI>HBr>HCl>HF
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B
HF>HCl>HBr>HI
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C
HCl>HF>HBr>HI
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D
HI>HCl>HF>HBr
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Solution

The correct option is C HF>HCl>HBr>HI
As we move down the group in hydrogen halides the thermal stability decreases due to decrease in bond strength.So the correct order of thermal

stability is HF>HCl>HBr>HI
Hence ,option B is correct.

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