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Q.

On heating limestone, carbon dioxide is given off. This operation in metallurgy is known as

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a

Calcination

b

Ore-dressing

c

Roasting

d

Smelting

answer is A.

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Detailed Solution

CaCO3→ΔCaO+CO2↑

When limestone is heated, CO2​ is given off. This metallurgical operation is known as calcination. In this process, ore is heated in the absence or limited amount of air. CO2​ is produced along with metal oxide.

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