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Mg has +2, S has +6, O has -2

Explanation: O (oxygen) generally has -2 oxidation state ( exceptions exist like peroxides)

Mg(magnesium) is an alkaline earth metal which has fixed oxidation state of +2 in its compunds.

S(sulphur) shows variable oxidation state..

To get its oxidation state: we use the fact the total sum of oxidation state of all atoms in a compound is zero. For ions this sum is equal to the charge on the ion.

Let oxidation state of S be x.

Then we have: +2 (for Mg) + (-2)*4(for 4 O atoms) + x = 0

Which gives x=+6.

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