What is the oxidation number of cl− in the perchlorate ion, assuming the cl−o bonds are all single bonds?

The molecular formula for perchlorate ion is: ClO₄⁻

The oxidation number of oxygen, O = -2

Let 'x' be the oxidation number of Cl-. Now the net charge on the system is -1

i.e.,  Cl + 4(O) = -1

(x) + (4)(-2) = -1

x = -1 + 8 = +7

Therefore, the oxidation number of Cl- in perchlorate ion is +7

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