On passing $H_2S$ gas through a solution of $Cu^{2+}$ and $Zn^{2+}$ ions,$CuS$ is precipitated first because
- ASolubility product of $CuS$ is equal to the ionic product of $ZnS$
- BSolubility product of $CuS$ is equal to the solubility product of $ZnS$
- CSolubility product of $CuS$ is lower than the solubility product of $ZnS$
- DSolubility product of $CuS$ is greater than the solubility product of $ZnS$
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