The oxidation number for S in the compound SO3 is +6 (option D). Details about oxidation number can be found below.
What is oxidation number?
Oxidation number of an element is the hypothetical charge of an atom within a molecule.
The oxidation number of elements in a compound adds up to the overall charge of that compound.
According to this question, O has an oxidation number of -2 in SO3, the oxidation number of S can be calculated as follows:
x - 2(3) = 0
x - 6 = 0
x = 6
Therefore, the oxidation number for S in the compound SO3 is +6.
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