During calcination:

Carbonate ores are changed into oxides

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Oxide ores are changed into carbonates

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Carbonate ores are changed into sulphides

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Oxide ores are changed into sulphides

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Solution

The correct option is A Carbonate ores are changed into oxides
During calcination, carbonate ores are decomposed into oxides liberating carbon dioxide by heating strongly in limited air/absence of air.
For example, $Z n C O_{3} \to Z n O + C O_{2}$

Hence, option A is the correct answer

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