Zinc is extracted from zinc sulphide (ZnS) by first converting it into zinc oxide (ZnO). This is done by:
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A.
dissolving ZnS in acid
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B.
direct electrolysis of ZnS
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C.
heating ZnS in the absence of air
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D.
heating ZnS in the presence of air
Correct Answer:
D. heating ZnS in the presence of air
Explanation:
The process of extracting zinc from its sulphide ore, known as zinc blende, involves roasting the ore by heating it intensely in the presence of excess air. This chemical reaction converts zinc sulphide into zinc oxide while releasing sulphur dioxide gas. Once converted to an oxide, the material can then be reduced using carbon to obtain pure metallic zinc. This method is preferred over heating in the absence of air or electrolysis because it effectively removes sulphur and prepares the metal for the final reduction stage.
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