When ammonium cyanate is heated for a long time, the product is:

Nitrous oxide

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Ammonium cyanide

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Nitrogen and water

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Biuret

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Solution

The correct option is D Biuret
When ammonium cyanate is heated urea is first formed
${N H}_{4} C N O A m m o n i u m C y a n a t e H e a t - -- \to {N H}_{2} C O {N H}_{2} u r e a$

Urea on further heating gives biuret
${N H}_{2} C O {N H}_{2} H e a t - -- \to {N H}_{2} C O N H C O {N H}_{2} B i u r e t + {N H}_{3}$

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