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Extraction of Moderately Reactive Metals

Why is roasti...

Question

Why is roasting used for sulphide ores

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Solution

Roasting converts the sulphide ores to oxides from which by reduction the oxides are converted to pure metals. For ex conversion of PbS to PbO followed by reduction with C gives lead.
2PbS + 3O₂ ------> 2 PbO + 2SO₂
PbO + C -----> Pb + CO

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