Answer in each case whether you will use an Oxidizing Agent (OA)or a Reducing Agent(RA) to make the reaction possible (write your answer as OA or RA in place of?). i)    H2O2       +    ?               →      O2   +    2H+   ii)      Cr2O7-2   +   H+   +   ?       →      Cr+3       +   H2O

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