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The main ore of lead is Galena (PbS). Lead is extracted from Galena ore either by i or ii

Auto reduction process is

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Both i & ii

None

answer is B.

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Detailed Solution

In Auto reduction process Pb from Its sulphide ore the ore is subjected partial roasting in air to give oxide .

When supply of air is stopped and the temperature is raised the rest sulphide reacts with oxide forms metal and $S O_{2}$ .

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