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Because this is not a peroxide or hydride, we can by rule state that hydrogen is in the +1 oxidation state and that oxygen is in the -2 state.

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Q: What are the oxidation numbers of hydroxide?
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Magmesium hydroxide formula?

Mg has an oxidation state of +2 & hydroxide has the oxidation state of -1. Formula of Magnesium hydroxide is Mg(OH)2


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