Q.

The oxidation numbers of Fe and S in iron pyrites are

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a

3,  -1

b

2,  -1

c

3,  -1.5

d

4,  -2

answer is B.

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Detailed Solution

Formula of Iron pyrites is FeS2, In this ‘Fe’ is in Ferrous state.∴The oxidation number of Fe and S in iron pyrites are respectively  +2,  -1.
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The oxidation numbers of Fe and S in iron pyrites are