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

1. NH2−
2. F−
3. I−
4. HS−

Correct answer: NH2−

Solution

NH2− has the greatest proton affinity because it is a strong base and readily accepts a proton to form NH3, a stable compound. Other ions like F− and I− are less basic, and HS− forms a weaker conjugate acid.

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