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Question: Answered & Verified by Expert
A mixture containing $\mathrm{Cu}^{2+}$ and $\mathrm{Ni}^{2+}$ can be separated for identification by
ChemistryPractical ChemistryJEE Main
Options:
  • A Passing $\mathrm{H}_2 \mathrm{~S}$ in acid medium
  • B Passing $H_2 S$ in alkaline medium
  • C Passing $\mathrm{H}_2 \mathrm{~S}$ in neutral medium
  • D Passing $H_2 S$ in dry mixture
Solution:
2566 Upvotes Verified Answer
The correct answer is: Passing $\mathrm{H}_2 \mathrm{~S}$ in acid medium
$\mathrm{Cu}^{2+}$ will be precipitated as $\mathrm{CuS}$ in acidic medium where as $\mathrm{Ni}^{2+}$ is not precipitated.

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