When a mixture of potassium cyanate and ammonium sulphate is heated, it gives:

urea

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methanamide

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ethanamide

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none

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Solution

The correct option is A urea
When a mixture of potassium cyanate and ammonium chloride is heated, it gives urea.

A solution of potassium cyanate and ammonium sulphate is evaporated to dryness when ammonium cyanate is formed, which then undergoes rearrangement to form urea.

$2 K C N O + (N H_{4})_{2} S O_{4} \to 2 N H_{4} C N O + K_{2} S O_{4}$

$N H_{4} C N O r e a r r a n g e m e n t - -------- \to H_{2} N C O N H_{2}$

Option A is correct.

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