What is the oxidation number of sulphur in SO2-4 ion

1.	What is the oxidation number of sulphur in SO^2-₄ ion
A.	-2
B.	+2
C.	+6
D.	8
Answer» D. 8

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Oxidation state of Mn in acidic KMnO4 change from is :

What is the oxidation number of sulphur in SO2-4 ion

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What is the oxidation number of sulphur in SO^2-₄ ion