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Which of the following reduction are act...

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

A

`Fe_(2)O_(3)+2Al to Al_(2)O_(3)+2Fe`

B

`Cr_(2)O_(3)+2Al to Al_(2)O_(3)+2Cr`

C

`2Na[Au(CN)_(2)]+Zn to Na_(2)[Zn(CN)_(2)]+2Au`

D

`2Cu_(2)S+2CuO to 6Cu+SO_(2)`

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The correct Answer is:
B,C,D
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