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An aqueous solution contains 0.10 M H2S and 0.20 M HCl. If the equilibrium constants for the formation of HS– from H2S is 1.0 × 10–7 and that of S2– from HSions is 1.2×10–13 then the concentration of S2– ions in aqueous solution is : 

(1) 3×10–20 

(2) 6×10–21 

(3) 5×10–19 

(4) 5×10–8 

1 Answer

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Best answer

Correct option(1) 3×10–20 

Explanation:

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