Which one of the following reactions is ...

Which one of the following reactions is an example of auto-reduction?

A

`Fe_3O_4+4C rarr 3Fe+4CO_2`

B

`Cu_2O+Crarr 2Cu+O`

C

`Cu^(2+)(aq)+Fe(s) rarr Cu(s)+Fe^(2+)(aq)`

D

`Cu_2O+1/2Cu_2S rarr 3Cu+1/2SO_2`

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The correct Answer is:

B

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