First slide
Classical idea of redox reactions

Which of the following reactions is not a redox reaction?


Oxidation state of K is +1 in both reactant and product. 

In (2), oxidation state of Cr(+6) does not change. 

In (3) oxidation states of Ca and C and O do not change.

In (4), the H2O2 which disproportionates is both oxidasing and a reducing agent. 

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