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Galena (an ore) is partially oxidised by...

Galena (an ore) is partially oxidised by passing air through it at high temperature. After some time the passage of air stopped, but the heating is continued in a closed furnace such that the contents undergo self-reduction. The weight (in kg) of Pb produced per kg of `O_(2)` consumed is_ ,
`"Atomic weights in g mol"^(-1): O =16,S=32,Pb=207`

Text Solution

Verified by Experts

It is an example of Auto-reduction of PbS. The reactions involved are :
`2PbS+3O_(2) to 2PbO+2SO_(2)`
`2PbO+PbS to 3Pb+SO_(2)`
3 moles of `O_(2)` produce Pb=3 mol.
96 kg of `O_(2)` produce `Pb=207xx3=621 kg`
1 kg of `O_(2)` produce `PB=(621)/(96)=6.47 kg`
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