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Question
Calculate the oxidation number of the underlined atom.
K2C2O4
Solution
K2C2O4
Oxidation number of K = +1
Oxidation number of O = –2
K2C2O4 is a neutral molecule.
∴ Sum of the oxidation number of all atoms = 0
∴ 2 × (Oxidation number of K) + 2 × (Oxidation number of C) + 4 × (Oxidation number of O) = 0
∴ 2 × (+1) + 2 × (Oxidation number of C) + 4 × (–2) = 0
∴ 2 × (Oxidation number of C) + 2 – 8 = 0
∴ 2 × (Oxidation number of C) = + 6
∴ Oxidation number of C = `+6/2`
∴ Oxidation number of C in K2C2O4 = +3
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