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Question

A company finds smithsonite (ZnCO3) in a digging area. Identify the final stage to extract the metal.

A
Reduction using coke
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B
Refining of Zn
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C
Roasting
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D
Electrolytic reduction
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Solution

The correct option is B Refining of Zn
  • The extraction of metals is done based on the reactivity of the metal.
  • Zinc falls under the category of moderately reactive metals in the reactivity series.
  • Hence, first the ore is converted to metal oxide to extract the metal.
  • Smithsonite is a carbonate ore of zinc, which means it needs to be calcined to convert the ore to metal oxide.
  • After the calcination, the metal oxide would be then required to be reduced.
  • Reduction can be done by reacting with coke or highly reactive metals.
  • After the reduction, refining of the the extracted metal, to pure form of zinc. is done
  • Therefore, refining of zinc is the final stage to extract the metal.

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