Which of the following equations represent oxidation reduction reaction ? Identify each oxidising agent and each reducing agent.
`{:((a),KOH+H_2O_2 , rarr,KHO_2+H_2O),((b),Cr_2O_7^(2-)+2OH^(-),rarr,2CrO_4^(2-)+H_2O),((c) ,K+O_2,rarr,2CrO_4^(2-)+H_2O),((d),Ca(HCO_3)_2, rarr,caCO_3+CO_2+H_2O):}`

Explanation

To determine which of the given equations represent oxidation-reduction (redox) reactions, we need to analyze each reaction for changes in oxidation states of the elements involved. A redox reaction involves the transfer of electrons, where one species is oxidized (loses electrons) and another is reduced (gains electrons).

Let's analyze each equation step by step:

### Step 1: Analyze each reaction

**(a) KOH + H2O2 → KHO2 + H2O**

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