Roasting differs from calcination because roasting is done

Question

Accepted Answer

A. In the presence of excess air

1. Sulphide ores need oxygen to convert to oxide.
2. Roasting is heating in excess air for that purpose.
3. Calcination, in contrast, uses no air.
4. Hence option A is correct.
_Source: Selina Concise Chemistry Class 10, Ch 7 Metallurgy (Mistral OCR'd PDF), section on roasting_

Answer

In a sealed vacuum container

Answer

Only in cold water solution

Answer

Only at low room temperature

Roasting differs from calcination because roasting is done

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