Which of the following process makes the ore porous?

Roasting

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Calcination

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Reduction

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Distillation

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Solution

The correct options are
A Calcination
B Roasting
Calcination is the process of heating the ore to high temperatures in the absence of air to remove impurities such as moisture, sulphur, arsenic and carbon dioxide. At this stage, the ore becomes porous. So it make ore porous.
Rusting is the process in which ore is heated at high temp. in presence of air, product formed by rusting are always porous.

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Which one of the following processes makes the ore porous?

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