What is the oxidation number of $C l$ in the $C l O_{3}^{-}$ ion?

-1

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-5

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Solution

The correct option is B 5
The oxidation number of chlorine can be $- 1, 0, + 1, + 3, + 4, + 5, o r + 7$ depending on the substance containing the chlorine.
So,
In $C l O_{3^{-}}$ if $O = - 2$

Then oxidation state of $C l = + 5$

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