Study the following equation and in each case decide whether the substance in bold type has been oxidized or reduced. explain your choice in terms of either oxygen transfer or electron transfer as appropriate. plz help!!

a) Oxidised. Oxygen transferred from CuO to Zn.

b) Reduced. Oxygen transferred from Iron oxide to Carbon.

c) Oxidised. Electrons transferred to

d) Reduced. Electrons are gained by $\mathrm{Cu^{+2}}$

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~courtney