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Chemical equations and calculations

Which of the following reactions is not a redox reaction?


(1) 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 oxidising and a reducing agent.

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