In the compound h2s hydrogen has an oxidation number of 1 + and sulfur has an oxidation number of

Oxidation number is defined as the total number of electrons that are gained or lost by the atom to form a chemical bond.

the oxidation number of the compound H₂S is 0.

the sum of the oxidation numbers of the individual elements should add up to the oxidation number of the compound.

(oxidation number of H x 2 H ions) + oxidation number of S = 0

since we know the oxidation number of H, lets name the oxidation number of S = x

(+1 * 2) + (x) = 0

2 + x = 0

x = - 2

oxidation number of S is - 2