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How many of the following pairs of ions can be separated by passing H2S gas in dilute HCl medium? Pairs: Bi³+ and Sn⁴+; Al³+ and Hg²+; Cd²+ and Zn²+; Fe³+ and Cu²+; As³+ and Sb³+

1. 1
2. 2
3. 3
4. 4

Correct answer: 3

Solution

In dilute HCl with H2S, only Group II sulfides precipitate. Pair 2 (Al³+ stays in solution; Hg²+ precipitates), Pair 3 (Zn²+ stays; Cd²+ precipitates), and Pair 4 (Fe³+ stays; Cu²+ precipitates) can be separated. Pairs 1 and 5 both precipitate together. Total = 3 pairs.

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