Q.

Down the group of halogen, the acidic character of H - A increases in the order.

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a

HF < HCl < HBr < HI

b

HCl < HF < HBr < HI

c

HCl < HBr < HI < HF

d

HI < HBr < HCl  < HF

answer is A.

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Detailed Solution

HF < HCl < HBr < HIDown the group the electronegativity decreases and the size increases. Thus, it becomes easy to lose H+ ion. This causes the increase in acidic strength down the group.
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Down the group of halogen, the acidic character of H - A increases in the order.