The correct order of acidic strength is

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(A) The correct order of acidic strength is $HF < HCl < HBr < HI$.As we move down the group in the periodic table,the size of the halogen atom increas

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$HF < HCl < HBr < HI$

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(A) The correct order of acidic strength is $HF As we move down the group in the periodic table,the size of the halogen atom increases,which leads to a decrease in the bond dissociation enthalpy of the $H-X$ bond.Since the $H-X$ bond becomes weaker down the group,it becomes easier to release the $H^+$ ion,thereby increasing the acidic strength.

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