Calculate the oxidation number of phosphorus

Question:

Calculate the oxidation number of phosphorus in the following species.

(a) Na2S2O3

(b) Na2S4O6

(c) Na2SO3

(d) Na2SO4

Solution:

Na2S2O3 x= +2

Na2S4O6 x= +5

Na2SO3 x= +4

Na2SO4 x= +6

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