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Question

Find the oxidation number of S in HSO3 ion.

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Solution

Let the oxidation number of S be x in HSO3 ion.
We know that, Ox. no. of H=+1
Ox. no. of O=2
So, Ox. no. H+ Ox. no. S + 3(Ox. no. O)=1
+1+x+3(2)=1
or +1+x6=1
or x5=1
or x=+51=+4
The oxidation number of S in HSO3 ion is +4.

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