Assertion (A): $HF$ is the weakest acid among the hydrogen halides in water. Reason (R): Fluorine is the least electronegative halogen.

ABoth A and R are true and R is the correct explanation of A
BBoth A and R are true but R is not the correct explanation of A
CA is true but R is false
DA is false but R is true

Answer: C

A is true because the very strong H-F bond (568 kJ/mol) makes ionisation difficult. R is false, since fluorine is the most electronegative element, so the answer is that A is true and R is false.

Practice p-Block Elements: Groups 17 and 18 More on Halogen compounds: HX, oxoacids, bleaching powder

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Assertion (A): HF is the weakest acid among the hydrogen halides in water. Reason (R): Fluorine is the least electronegative halogen.

Answer: C

More questions on Halogen compounds: HX, oxoacids, bleaching powder

Assertion (A): $HF$ is the weakest acid among the hydrogen halides in water. Reason (R): Fluorine is the least electronegative halogen.