Assign oxidation number to all the atoms present in –
a) C2O42- b) Mn2O3 c) Al(OH)4-
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Oxidation numbers are assigned to elements using these rules:
Rule 1: The oxidation number of an element in its free (uncombined) state is zero — for example, Al(s) or Zn(s). ...
Rule 2: The oxidation number of a monatomic (one-atom) ion is the same as the charge on the ion, for example:
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