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Calculate the oxidation number of all th...

Calculate the oxidation number of all the atoms in the following well known oxidants.
`KMnO_4,K_2Cr_2O_7, KClO_4`

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The correct Answer is:
`K(+1), Mn(+7), O(-2),K(+1) , Cr (+6) , O (-2) ,K+(1)`
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MODERN PUBLICATION-REDOX REACTIONS -Practice problems
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