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

1. $\mathrm{H}_2 \mathrm{~S}$
2. $\mathrm{NH}_3$
3. $\mathrm{PH}_3$
4. $\mathrm{H}_2 \mathrm{O}$

Solution

Asked in: JEE Main 2003

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