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Roasting, calcination and reduction
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mt057
Strong heating of limestone in the absence of air, a calcination, evolves which gas?
A
O
X
2
B
CO
C
SO
X
2
D
CO
X
2
Answer: D
Calcination thermally decomposes a carbonate ore without added air.
CaCO
X
3
CaO
+
CO
X
2
, so carbon dioxide is evolved.
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