Question

Which one of the following reactions is an example of auto-reduction?
A. `Fe_(3)O_(4)+4C to 3Fe + 4CO_(2)`
B. `Cu_(2)O+Cto2Cu+CO`
C. `Cu^(2+)(aq)+Fe(s) to Cu(s) +Fe^(2+)(aq)`
D. `Cu_(2)O+1/2Cu_(2)S to 3Cu +1/2 SO_(2)`

Answer 1

`(c) "Cu"_(2)O+1/2"Cu"_(2)"S" to "3Cu"+1/2"SO"_(2)`