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Determine the oxidation number of all the atoms in the following oxidants: KMnO4, K2Cr2O7 and KClO4.

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In KMnO       K = +1,       Mn = +7,     O = –2 

In K2Cr2O7     K = +1,       Cr = +6,       O = –2 

In KClO4          K = +1,       Cl = +7,       O = –2.

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