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An aqueous solution contains 0.10 M H 2 S and 0.20 M HCl. If the equilibrium constants for the formation of HS – from H 2 S is 1.0 × 10 –7 and that of S 2– from HS – ions is 1.2 × 10 –13 then the concentration of S 2– ions in aqueous solution is -

1. 5 × 10 –8
2. 3 × 10 –20
3. 6 × 10 –21
4. 5 × 10 –19 Students may find similar question in CP exercise sheet : [ JEE Main, Chapter : Chemical Equilibrium, Solved Example, Page 33 Q. No. 61 ]

Correct answer: 3 × 10 –20

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