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The oxidation state of an individual sulfur atom in BaSo4 is +6.
The oxidation state of an individual sulfur atom in MgSO4 is +6.
The oxidation state of an individual sulfur atom in (SO3)2- is 4.
If you mean SO3^-2 (the sulfite anion), then S has an oxidation number of 4+, since each O atom is 2-. In sulfur trioxide, SO3, the S atom has an oxidation number of 6+.
Since the total molecule must have zero net oxidation state and there are two oxygen atoms but only one sulfur atom, the sulfur must have oxidation state +4.
The oxidation state of an individual sulfur atom in BaSo4 is +6.
The oxidation state of an individual sulfur atom in MgSO4 is +6.
The oxidation state of an individual sulfur atom in (SO3)2- is 4.
If you mean SO3^-2 (the sulfite anion), then S has an oxidation number of 4+, since each O atom is 2-. In sulfur trioxide, SO3, the S atom has an oxidation number of 6+.
Since the total molecule must have zero net oxidation state and there are two oxygen atoms but only one sulfur atom, the sulfur must have oxidation state +4.
+5
5+
in CaCO3 carbon is in the 4+ oxidation state.
The oxidation state of N in HNO3 is +5. Oxygen is -2 and H is +!.
There are no nitrogen atoms in CaCO3!
H2SO4 is a compound and as such does not have an oxidation number. The individual atoms in this compound have oxidation number +1 for each hydrogen atom, +6 for sulfur, and -2 for each oxygen atom.
There are NO carbon (C) atoms in potassium nitrate (KNO3). B.t.w. atoms always have an oxidation state to be zero.