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The chemical formula for the compound Iron (III) sulphide is:

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{Fe}_{3} S_{2}

FeS

Fe S_{3}

{Fe}_{2} S_{3}

answer is A.

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Detailed Solution

The chemical formula for the compound Iron (III) sulphide is ${Fe}_{2} S_{3}$ .

Iron (Fe) has a valency of +3 and nitrate ( $S^{2 -}$ ) has a valency of -2.
Therefore, by criss-cross method, we can find the formula of the compound as :
${Fe}^{3 +}$ $S^{2 -}$
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2 3
Therefore, the formula of the compound becomes ${Fe}_{2} S_{3}$ .

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