on heating a mixture of pottasium cynate and ammonium chloride, it gives

When a mixture of potassium cyanate and ammonium chloride is heated,urea is formed.This chemical reaction was discovered in 1828 by Friedrich Wohler in an attempt to synthesize ammonium cyanate. It is considered the starting point of modern organic chemistry and of great historical significance because for the first time an organic compound(urea) was produced from inorganic reactants.
The reaction takes place in following way-
1.First potassium sulphate and ammonium cyanate are formed.
(NH4)2SO4 + 2KCNO -------> K2SO4 + 2NH4CNO
2.On heating the above mixture urea is formed.
K2SO4 + NH4CNO ---------> 2NH2CONH2

The reaction of Ammonium sulphate and Potassium cyanate is also known as Wohlers syntheses which is used to produce urea. The chemical reaction is:- Step 1. (NH4)2SO4 + 2KCNO -------> K2SO4 + 2NH4CNO. Step 2. After heating the product if the reaction we get:- K2SO4 + NH4CNO ---------> 2NH2CONH2. We know that 2NH2CONH2 is also known as urea. This is how urea is formed. Thank You.