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Question

Which of the following processes makes the ore porous?

A
Distillation
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B
Reduction
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C
Calcination
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D
All of these
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Solution

The correct option is B Calcination
Calcination involves simple decomposition of ore on heating below its melting point usually in absence of air to produce new compounds having higher % of metal as well as removing the moisture, organic matter and volatile impurities and hence calcination makes the ore porous.

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