CBSE Class 10 Answered
The O.N. of S increases from -2 to 0. So it is undergoing oxidation and O.N. of Cl2 decreases from 0 to -1. So it is undergoing reduction. Therefore it is a redox reaction.
CuO + H2 → Cu +H2O
In this redox reaction, CuO is getting reduced to Cu since Oxygen is getting removed. So, the conversion of CuO to Cu is a reduction reaction. H2 is getting oxidised to H2O. So, it is an oxidation reaction.
Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)
Thr oxidation state of Fe changes from 0 to +2 and oxidation state of Cu changes from +2 to 0.
MnO4-+ I- → MnO2 + I2
Here I- is oxidised to I2 and MnO4 - is reduced to MnO2.
Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O
In this reaction, Pb is getting oxidised to PbSO4 and PbO2 is reduced to PbSO4.