The process in which carbonate ores are changed into oxides by heating strongly in absence of air, is:

Smelting

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Roasting

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Calcination

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Levigation

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Solution

The correct option is C Calcination
In smelting, ore is heated in presence of a reducing agent. Roasting is a process when ore is heated in excess of air.
The carbonate ores are changed into oxides by heating strongly in limited air. This process is known as calcination.
In levigation process, grinding of ore is done when it is wet.

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