Question

The oxidation number of the material KO3?

Answer 1

$<I> k is alkali metal,,and it always show +1oxidation state. K is 1st group element & shows +1oxidation no. 2K is combines with O having -2& gives K2O , there isn't any compound KO3 around where.oxidation no. of k is +1 as it belongs to the first grp.$

Answer 2

Here in this compound K has oxidation no 6 because take K as x and O. has no -2 so x-2*3 equals to x-6equals to 0 so x that is K has oxidation no +6