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Which one of the following substances has the highest proton affinity ?

1. H2S
2. NH3
3. PH3
4. H2O

Correct answer: NH3

Solution

Ammonia (NH3) has the highest proton affinity among the given options due to its ability to stabilize the positive charge on the resulting ammonium ion (NH4+) through effective resonance and inductive effects, making it more favorable for protonation compared to the other substances.

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