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Q.

The reaction that do NOT define calcination is

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a

${Fe}_{2} O_{2} \cdot {XH}_{2} O \overset{Δ}{\to} {Fe}_{2} O_{3} + {XH}_{2} O$

b

${ZnCO}_{3} \overset{Δ}{⟶} ZnO + {CO}_{2}$

c

${CaCO}_{3} \cdot {MgCO}_{3} \overset{Δ}{\to} CaO + MgO + 2 {CO}_{2}$

d

$2 {Cu}_{2} S + 3 O_{2} \overset{Δ}{\to} 2 {Cu}_{2} O + 2 {SO}_{2}$

answer is D.

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Detailed Solution

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Calcination is carried out for carbonates and oxide ores in the absence of oxygen.
Roasting is carried out mainly for the sulfide ores in the presence of excess oxygen.

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The reaction that do NOT define calcination is