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An aqueous solution contains 0.10 M H(2)...

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 xx 10^(-7)` and that of `S^(2-)` from `HS^(-)` ions is `1.2 xx 10^(-13)` then the concentration of `S^(2-)` ions in aqueous solution is -

A

`6 xx 10^(-21)`

B

`5 xx 10^(-19)`

C

`5 xx 10^(-8)`

D

`3 xx 10^(-20)`

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