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Usually the oxidation no of oxygen is -2 and the oxidation no of hydrogen is +1 in a compound.
1+ is the normal oxidation number for hydrogen
2-
Phosphorus in PCl5 Nitrogen in Nitrate (NO3-) ion
2
Hydrogen has an oxidation number of 0 in H2. In compounds it is generally +1, the exception is when it is present as the hydride ion, H- , when has an oxidation state of -1
The oxidation number of a compound is zero (nitrogen -3, hydrogen +1, chromium +3, oxygen -2).
+1 for H, -1 for Cl
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.
-1. The hydrogen is present as the anion, H-.
The hydrogen atoms are each in the 1+ oxidation state. The oxygen is in it's 2- oxidation state.
Because nitrogen forms a compound with hydrogen called anhydrous ammonia consisting of one nitrogen atom and three hydrogen atoms. Since hydrogen has an oxidation number of one, nitrogen must have an oxidation number of three to make a "neutral" molecule.