Science Quiz / Oxidation States of Various Elements

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Can you name the oxidation states of arious elements in complexes?

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ComplexOxidation stateOverall charge
Nickel in nickel EDTA0
Vanadium in ammonium metavanadate0
Sodium in sodium hydroxide0
Manganese in manganese dioxide0
Carbon in diaquahydrogencarbonate1+
Cobalt in trichlorocobaltAte0

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