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Redox reactions

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Redox reactions

Post  ibelieveinme@ on Sat Nov 29, 2014 12:26 am

sir, how to find oxidation number of a central element?
i'm little bit of confused... Exclamation
question is find the oxidation number of central element in:
(1)H3AsO4
(2)K2Cr2O7
(3)H2SO5

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