is ZnO + c gives to Zn + CO is example for redox and also displacement reaction
In the reaction ZnO + C → Zn + CO
ZnO is getting reduced(loss of O) by C and in the process C gets oxidized to CO(gain of O). Also, C is displacing Zn from its oxide, thus it is also a displacement reaction.
Therefore, this reaction is both a redox as well as displacement reaction.