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     EduGorilla 
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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 HS ions is 1.2×10−13 then the concentration of S2− ions in aqueous solution is : 

    Options :-

    1. 3×10−20

    2. 6×10−21

    3. 5×10−19

    4. 5×10−8

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