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The reaction that does NOT define calcination is:
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Verified Answer
The correct answer is:
$2 \mathrm{Cu}_{2} \mathrm{~S}+3 \mathrm{O}_{2} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{Cu}_{2} \mathrm{O}+2 \mathrm{SO}_{2}$
Calcination involves heating of carbonates or hydrated oxides in absence of air.
$$
\therefore 2 \mathrm{Cu}_{2} \mathrm{~S}+3 \mathrm{O}_{2} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{Cu}_{2} \mathrm{O}+2 \mathrm{SO}_{2} ; \text { is roasting }
$$
(heating in a regular supply of air).
$$
\therefore 2 \mathrm{Cu}_{2} \mathrm{~S}+3 \mathrm{O}_{2} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{Cu}_{2} \mathrm{O}+2 \mathrm{SO}_{2} ; \text { is roasting }
$$
(heating in a regular supply of air).
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