[DPMT 2000]
A) Hydrocyanic acid
B) Ammonia
C) Ammonium cyanide
D) Urea
Correct Answer: D
$ {{(NH_4)}_2}SO_4+KCNO\to $ $ NH_4CNO+K_2SO_4\to \underset{Urea}{\mathop{NH_2-CO-NH_2}} $
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