The conversion of K2Cr2O7 into Cr2 (SO4)3 is a process of
Reduction
Decomposition
Substitution
Oxidation
Oxidation number of Cr changes from +6 in K2Cr2O7 to +3 in Cr2 (SO4)3. So, this is an example of reduction.
2Cu+O22CuO Which type of reaction is this?
The formation of copper oxide from copper in the presence of oxygen is an ____________ reaction.
2Cu+O2→2CuO