Question

the oxidation number of oxygen is positive in ​

Answer 1

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each hydrogen has an oxidation state of +1, each oxygen must have an oxidation state of -1 to balance it. The problem here is that oxygen isn't the most electronegative element.

Answer 2

Answer:

An element in a free form has OS = 0. In a compound or ion, the sum of the oxidation states equals the total charge of the compound or ion. Fluorine in compounds has OS = −1; this extends to chlorine and bromine only when not bonded to a lighter halogen, oxygen or nitrogen.

The oxidation number of a free element is always 0.

The oxidation number of a monatomic ion equals the charge of the ion.

The oxidation number of

H

is +1, but it is -1 in when combined with less electronegative elements.

The oxidation number of

O

in compounds is usually -2, but it is -1 in peroxides.

The oxidation number of a Group 1 element in a compound is +1.

The oxidation number of a Group 2 element in a compound is +2.

The oxidation number of a Group 17 element in a binary compound is -1.

The sum of the oxidation numbers of all of the atoms in a neutral compound is 0.

The sum of the oxidation numbers in a polyatomic ion is equal to the charge of the ion.

Explanation:

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