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Determine the oxidation number of all th...

Determine the oxidation number of all the atoms in the following well known oxidants `KMnO_(4),K_(2)Cr_(2)O_(7) and LiAIH_(4)`

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O.N of S changes form -2 in `H_(2)S` and +4 in `SO_(2)` to zero in elemental suphur
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