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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.
in CaCO3 carbon is in the 4+ oxidation state.
There are NO carbon (C) atoms in potassium nitrate (KNO3). B.t.w. atoms always have an oxidation state to be zero.
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.
+5
5+
in CaCO3 carbon is in the 4+ oxidation state.
+5; each oxygen is -2 giving -8 reduced by the ionic charge of -3 to +5
The oxidation state of N in HNO3 is +5. Oxygen is -2 and H is +!.
There are no nitrogen atoms in CaCO3!
phosphorus as well as the PIII oxidation state has an oxidation state of PV. Its the +5 oxidation state we need to bond 4 chlorines to phosphorus. So we also need another monovalent atom e.g. a halogen to balance up the oxidation state. One possibility for a neutral compound would be a mixed halide e.g. FPCl4 This compound is known and is usually called phosphorus tetrachloride fluoride. A cheeky answer would be PCl5 it has four chlorine atoms too!
There are NO carbon (C) atoms in potassium nitrate (KNO3). B.t.w. atoms always have an oxidation state to be zero.
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+.