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Sulphur when ...

Question

Sulphur when warmed with nonmetal in the absence of air, forms a mixture of non metallic trisulphide and pentasulphide. Identify the nonmetal and give the reactions.

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Solution

Trisulphide : $P_{4} + 3 S ⟶ P_{4} S_{3}$
Phosphorus pentasulfide is the inorganic compound with the formula $P_{2} S_{5}$ or dimer $P_{4} S_{10}$ .
Pentasulphide : $4 {F e}_{2} P + 18 S ⟶ P_{4} S_{10} + 8 F e S$
From this we can conclude that the non-metal is Phosphorus.

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