Determine the oxidation states of the elements in the compounds listed. none of the oxygen-containing compounds are peroxides or superoxide.
(a)h3po4
(b)al(oh)3
(c)seo2
(d)kno2
(e)in2s3
(f)p4o6

Explanation:

You need to remember that the oxidation number of H is +1, except when it is in a metal hydrites like NaH, where its oxidation number is -1. Then, the oxidation number of O is -2, but in peroxides is -1. So with these rules you just have to multiply the ox. number with the name of atoms and all the elements in the reaction must sum 0.