Among the following acids,the weakest one is

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(A) The acidic strength of hydrohalic acids $(HX)$ depends on the bond dissociation enthalpy of the $H-X$ bond.As the size of the halogen atom increas

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$HF$

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(A) The acidic strength of hydrohalic acids $(HX)$ depends on the bond dissociation enthalpy of the $H-X$ bond.As the size of the halogen atom increases from $F$ to $I$,the bond length increases and the bond dissociation enthalpy decreases.Therefore,the ease of releasing $H^+$ ions increases in the order: $HF Since $HF$ has the shortest bond length and the highest bond dissociation enthalpy,it is the weakest acid among the given options.

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