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

(a) $I^-$

(b) $HS^-$

(c) $NH^-_2$

(d) $F^-$

1 Answer

  • Strongest proton affinity will be for species wich is the strongest base or whose conjugate acid is the weakest.
Answer: $NH^-_2$
The conjugate of $NH^-_2$ is $NH_3$ which is the weakest acid out of HI, $H_2S$, $NH_3$ and HF.


answered Nov 27, 2013 by mosymeow_1

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