Hello aspirant,
Hope you are doing great. The oxidation number of Co in {CoBr2(CN)2}+, in the following way,
Choose x as the oxidation number for the Co,
then,
X + 2 (-1) + 2 (0) = +1, then,
X - 2 = 1, i.e., X = 1 +2, which is equal to +3.
Therefore, the oxidation number is +3.
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