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Which one of the following metals cannot...

Which one of the following metals cannot be extracted by carbon reduction?

A

`Zn`

B

`Fe`

C

`A1`

D

`Sn`

Text Solution

Verified by Experts

The correct Answer is:
C
Aluminium is exteracted by electrolytic reduction of mixture of molten `A1_(2)O_(3) +Na_(3)A1F_(6) +CaF_(2)`.
Due to vergy high enegry of dissocation of `a1_(2)O_(3)`, the reduction at such high temperature will give carbide in place of metallic `a1` according to the following reaction.
`2A1_(2)O_(3) +6C overset(Delta)rarrA1_(4)C_(3) +3CO_(2)`.
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