Which of the following reactions is not a redox reaction?

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H2O2+KOH⟶KHO2+H2O

Cr2O72−+2O⊝H⟶2CrO42−+H2O

CaHCO32⟶ΔCaCO3+CO2+H2O

H2O2⟶H2O+12O2

answer is A.

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Detailed Solution

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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