Why we take (-1) instead of (-2) oxidation number of oxygen in case of

1.	Why we take (-1) instead of (-2) oxidation number of oxygen in case of cao2-2
Answer» General oxidation number of oxygen in its compound state is -2But in oxygen linkage i.e in peroxides it exhibits -1 oxidation state<br>As the oxidation stae of Ca is +2.we take it (-1)

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