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Q.

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

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Auto reduction process is

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a

i

b

ii

c

Both i & ii

d

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 SO2.

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