$H_2S$ is passed into 1 $\text{dm}^3$ of a solution containing 0.1 moles of $Zn^{2+}$ and 0.01 moles of $Cu^{2+}$ until the sulfide ion concentration reaches $8.1 \times 10^{-19}$ moles. 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]

Question

$H_2S$ is passed into 1 $\text{dm}^3$ of a solution containing 0.1 moles of $Zn^{2+}$ and 0.01 moles of $Cu^{2+}$ until the sulfide ion concentration reaches $8.1 \times 10^{-19}$ moles. 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]

Only $ZnS$ precipitates

Both $CuS$ and $ZnS$ precipitate

Only $CuS$ precipitates

No precipitation occurs

Solution

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