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Q.

The process of heating concentrated ore below its melting point in the absence of air is called


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a

Roasting

b

Ore dressing 

c

Pyrolysis

d

Calcination

answer is A.

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Detailed Solution

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The process of heating concentrated ore below its melting point in the absence of air is called calcination.
The heating of concentrated ore below its melting point in absence of air is called calcination. Calcination is used for carbonate,hydroxide or hydrated oxide. It is used for the purpose of removing impurities, volatile substances. The example of calcination reaction is
CaCO3→CaO+CO2
 
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