Question

find oxidation number of the following
1-H^2SO^3
2-H^2S^2O^3​

Answer 1

In H2SO3, Sulphur exhibits a valency of 4. Its oxidation number is +4. Oxidation numbers of Hydrogen & oxygen are +1 & -2 respectively.

As 2 (1) + 4 (1) + 3 (-2) = 0, H2SO3 is chargeless.

In thiosulphate, two sulphurs have oxidation state of -2 and +6. (as per suggestions). Sulphur bonded to three oxygen is considered to have +6 (Sulphur A) and other sulphur has -2 (Sulphur B).