The sodium extract of an organic compound on boiling with $H N O_{3}$ and on subsequent treatment with ammonium molybdate solution gives a yellow precipitate. Which of the following elements may be present in the compound?

Nitrogen

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Sulphur

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Phosphorus

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Halogen

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Solution

The correct option is C Phosphorus
The organic compound is heated with an oxidizing agent to oxidize phosphorous to phosphate. The solution is then boiled with concentrated $H N O_{3}$ and treated with ammonium molybdate. Yellow precipitate confirms the presence of phosphorous.

$N a_{3} P O_{4} + 3 H N O_{3} \to H_{4} P O_{4} + 3 N a N O_{3}$

$H_{3} P O_{4} + 12 (N H_{4})_{2} M o O_{4} + 21 H N O_{3} \to (N H_{4})_{3} P O_{4} .12 M o O_{3} + 21 N H_{4} N O_{3} + 12 H_{2} O$

$H e n c e t h e c o r r e c t a n s w e r i s o p t i o n (C) .$

Suggest Corrections

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