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Q.

When limestone is heated strongly, it gives off ${CO}_{2}$ . In metallurgy this process is known as

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a

Calcination

b

Roasting

c

Smelting

d

Ore dressing

answer is A.

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Detailed Solution

${CaCO}_{3} \to CaO + {CO}_{2}$

Heating the ore in absence of air is calcination.

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When limestone is heated strongly, it gives off CO2. In metallurgy this process is known as