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Which one of the following ionic species has the greatest proton affinity to form stable compound?

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Which one of the following ionic species has the greatest proton affinity to form stable compound?

(a) Cl-

(b) F-

(c) I-

(d) Br-

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Correct answer: (b) F-

Explanation:

Proton affinity decreases in moving across the period from left to right due to increase in charge, within a group the proton affinities decreases from top to bottom.

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