Which of the following ore is concentrated using group 1 cyanide salt ?

Calamine

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Siderite

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Malachite

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Sphalerite

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Solution

The correct option is D Sphalerite
$\begin{matrix} Ore & Formula Sphalerite & Z n S Siderite & F e C O_{3} Malachite & C u (O H)_{2} . C u C O_{3} Calamine & Z n C O_{3} \end{matrix}$

$Z n S + 4 N a C N \to [Z n (C N_{4}]^{2 -} + 4 N a^{+} + S^{2 -}$
the reagent $N a C N / K C N$ is used to suppress the floating characteristics of $Z n S$ by forming a soluble complex with $K C N .$

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