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The answer to each of the following is a...

The answer to each of the following is a non-negative integer.
Find the number of reactions, among the following. Where `H_2O_2` acts as reducing agent.
`KMnO_4+H_2O_2overset(H+)to`
`NaOCl_2+H_2O_2to`
`H_2S+H_2O_2to`
`K_4[Fe(CN)_6]+H_2O_2overset(H+)to`
`C_2O_4^(2-)+H_2O_2overset("amyl alcohol")to`

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The correct Answer is:
2
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