Explanation

It is +8.See, if there isn’t any charge denoted in the molecule, then we are not gonna consider it ourself.Also, we know that the most common oxidation state of O is -2, which is the case here also.If x is the oxidation number of Os, thenx + 4(-2) = 0 gives, x = +8

We know that, Redox reactions are comprised of two parts, a reduced half and an oxidized half, that always occur together. The reduced half gains electrons and the oxidation number decreases, while the oxidized half loses electrons and the oxidation number increases.

Correct option: $$D$$

Explanation:

Step: 1 Calculation of oxidation state of Magnetite:Magnetite is one of the main iron ores found in the earth's crust. Chemical formula is $$Fe_3O_4$$. It is the stoichiometric composition of $$FeO$$ and $$Fe_2O_3$$.For $$FeO$$, let oxidation number assumed be $$X$$

For $$Fe_2O_3$$, let the oxidation number assumed be $$X$$

So, $$ 2X+3\left ( -2 \right )=0$$ $$\Rightarrow X=+3$$

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