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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 : P4+3SP4S3
Phosphorus pentasulfide is the inorganic compound with the formula P2S5 or dimer P4S10.
Pentasulphide : 4Fe2P+18SP4S10+8FeS
From this we can conclude that the non-metal is Phosphorus.

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