The oxidation numbers of Fe and S in iron pyrites are respectively:

3, -1

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2, -1

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3, -1.5

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4, -2

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Solution

The correct option is A 2, -1
$F e S_{2} -$ formula of iron pyrite
$F e$ in $F e S_{2}$ is in ferrous state.
The oxidation of $F e$ in $F e S_{2}$ is +2.
In $F e S_{2}$ , $S_{2}^{2 -}$ is persulphide ion.
Oxidation state of $S$ in $F e S_{2}$ is -1.
The oxidation number of $F e$ and $S$ in iron pyrites are respectively 2, -1.

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