Question

what is oxidation number of chlorine ?

Answer 1

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The oxidation number of simple ions is equal to the charge on the ion.
The oxidation number of sodium in the Na+ ion is +1,for example, and the oxidation number of chlorine in the Cl- ion is -1.

Now ,
The oxidation number of Chlorine element is 0
because Chlorine is in elemental form.
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Answer 2

The oxidation number of simple ions is equal to the charge on the ion. The oxidation number of sodium in the Na+ ion is+1, for example, and the oxidation number of chlorine in the Cl- ion is -1.
hope u understood