$H_{2}S$ is passed into $1 \ L$ of a solution containing $0.1 \ mole$ of $Zn^{2+}$ and $0.01 \ mole$ of $Cu^{2+}$ until the sulphide ion concentration reaches $8.1 \times 10^{-19} \ M$. Which one of the following statements is true? $[K_{sp}$ of $ZnS$ and $CuS$ are $3 \times 10^{-22}$ and $8 \times 10^{-36}$ respectively.$]$
- AOnly $ZnS$ precipitates
- BBoth $CuS$ and $ZnS$ precipitate
- COnly $CuS$ precipitates
- DNo precipitation occurs
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|---|---|
| $I$ | $1.74 \times 10^{-16}$ |
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| $III$ | $8.2 \times 10^{-46}$ |
| $IV$ | $5.0 \times 10^{-34}$ |
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