Question

__________ is the undesirable by-product produced in the manufacture of urea.

• A. Biuret
• B. Ammonium carbonate
• C. Carbon dioxide
• D. Ammonium carbamate

Answer 1

The correct option is A Biuret

Biuret is a chemical compound with the chemical formula $C_2{H}_5{N}_3{O}_2$. It is also known as carbamylurea. It is the result of condensation of two molecules of urea and is an impurity in urea-based fertilizers.

The most common impurity of synthetic urea is biuret, which impairs plant growth. Biuret is undesirable in fertilizer urea because it is toxic to crop plants, although to what extent depends on the nature of the crop and the method of application of the urea.