The correct order of heat of formation of halogen acids is (a) HI > HBr > HCl > HF
The correct order of heat of formation of halogen acids is
(a) HI > HBr > HCl > HF
(b) HF > HCl > HBr > HI
(c) HCl > HF > HBr > HI
(d) HCl > HBr > HF > HI
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(b) On moving from top to bottom of halogen group the bond dissociation energy of hydrogen halides decreases and so the heat of formation of halogen acids also decreases.
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