Question

which of the following do not represent a redox reaction?

Answer 1

Explanation:

PCl5→PCl3+Cl2

+5            +3      redox reaction

2Ca(OH)2+2Cl2→Ca(ClO)2+CaCl2+2H2O

                         0                     +1                  -1                  redox reaction

SO52−+2I⊝+2H⨁→I2+SO42−

                -1                          0          redox reaction

Cr2O72−+2O⊝H→CrO42−+H2O

   +6                            +6    

Since, there is no change in oxidation state in this reaction, it is not a redox reaction.

I hope it will help you out.