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Question

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

A
Calamine
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B
Siderite
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C
Malachite
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D
Sphalerite
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Solution

The correct option is D Sphalerite
OreFormulaSphaleriteZnSSideriteFeCO3MalachiteCu(OH)2.CuCO3CalamineZnCO3

ZnS+4 NaCN[Zn(CN4]2+4 Na++S2
the reagent NaCN/KCN is used to suppress the floating characteristics of ZnS by forming a soluble complex with KCN.

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