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JEE Mains · Chemistry · STD 11 - 6.2. Equilibrium - II (icon Equilibrium)
Which one of the following arrangements represents the correct order of the proton affinity of the given species
- A \({I^ - } < {F^ - } < H{S^ - } < N{H_2}^ - \)
- B \(H{S^ - } < N{H_2}^ - < {F^ - } < {I^ - }\)
- C \({F^ - } < {I^ - } < N{H_2}^ - < H{S^ - }\)
- D \(N{H_2}^ - < H{S^ - } < {I^ - } < {F^ - }\)
Answer & Solution
Correct Answer
(A) \({I^ - } < {F^ - } < H{S^ - } < N{H_2}^ - \)
Step-by-step Solution
Detailed explanation
The species with the greatest proton affinity will be the strongest base, and its conjugate acid will be the weakest acid. The weakest acid will have the smallest value of \(K_a\). Since \(HI\) is a stronger acid than \(HF\) which is a stronger acid than \(H_2S\), a partial…
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