A solution containing and is treated with excess . When is passed through the resulting solution, which of the following happens?

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Question

A solution containing $Cu^{2+}$ and $Cd^{2+}$ is treated with excess $KCN$. When $H_2S$ is passed through the resulting solution, which of the following happens?

Prashant Kotian · Accepted Answer

Correct answer: C. Both form soluble cyano complexes. The complex is highly stable and gives no free to precipitate. The complex is less stable, dissociates slightly, and allows yellow to precipitate.

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