First slide

General methods of extraction of elements from the earth crust

Question

Select the correct statements for calcination:

Moderate

A

Carbonate ore is converted in oxide ore
B

Hydrated oxide ore is converted into its oxide ore
C

Oxidisable volatile impurities are removed by calcination process
D

Only calcination occurs for carbonate or oxide ore

Solution

Calcination cant be done for carbonate ores, since there is a chance that the ore may decompose.

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