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Q.

Affinity for hydrogen decreases in the group fluorine to iodine. Which of the halogen acids should have highest dissociation enthalpy?

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a

HI

b

HF

c

HCl

d

HBr

answer is A.

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Detailed Solution

On moving down the groups from HF to HI,
(i) Size of halogen atom increases
(ii) H-X bond length increases
(iii) Bond energy decreases

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