A) Is an amide of carbonic acid
B) It is diamide of carbonic acid
C) Gives carbonic acid on hydrolysis
D) Resembles carbonic acid
Correct Answer: B
Solution :
Urea is the diamide of carbonic acid. \[\underset{\text{carbonic acid}}{\mathop{HO-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-OH}}\,+2N{{H}_{3}}\xrightarrow{-{{H}_{2}}O}\underset{\text{Urea}}{\mathop{{{H}_{2}}N-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-N{{H}_{2}}}}\,\] So two mole of \[N{{H}_{3}}\] required that why it is the diamide of carbonic acid.
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