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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.

Chemistry

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