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Question

Calcination is a process in which the ore is heated strongly in the absence of air to remove volatile impurities. It thermally decomposes the carbonate.
ACalcination−−−−−−CaO+MgO+2CO2
find out A:

A
CaCO3
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B
MgCO3
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C
CaCO3.MgCO3
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D
CaSO4.MgCO3
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