Which of the following reduction reactions are actually employed in commercial extraction of metals?

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Fe2O3+2Al→Al2O3+2Fe

Cr2O3+2Al→Al2O3+2Cr

2NaAu(CN)2+Zn→Na2Zn(CN)4+2Au

Cu2S+Pb→Cu+PbS↓

answer is B.

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Detailed Solution

alumino thermit process is only for weilding purpose not for extraction

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