A) +6
B) +3
C) +2
D) -2
Correct Answer: A
Solution :
Key Idea: The sum of oxidation states of all elements in an ion is equal to charge on it. Let the oxidation state of S in \[SO_{4}^{2-}=x\] \[\therefore \] \[x+(-2\times 4)=-2\] or \[x=+6\]
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