Question

D. Statement given below are incorrect. Write the correct statements.

(ii) Urea is an important fertiliser prepared by mixing 2 Volumes of nitrogen with one volume of carbon dioxide at a temperature of 150 ^oC and 150 atmosphere pressure.

Answer 1

Corrected statement: Urea is an important fertilizer prepared by mixing 2 Volumes of ammonia with one volume of carbon dioxide at a temperature of $150°\mathrm{C}$ and $150$ atmospheric pressure.

• Urea is now produced in large quantities commercially from liquid ammonia and liquid carbon dioxide.
• Under high pressures and high temperatures, these two compounds mix to form ammonium carbamate, which then decomposes at much lower pressures to yield urea and$\underset{\mathrm{Ammonia}}{2{\mathrm{NH}}_3\left(\mathrm{g}\right)}+\underset{\mathrm{carbon}\mathrm{dioxide}}{{\mathrm{CO}}_2\left(\mathrm{g}\right)}\to \underset{\mathrm{ammonium}\mathrm{carbamate}}{{\mathrm{H}}_2\mathrm{N}-{{\mathrm{CO}}_2}^{-}{{\mathrm{NH}}_4}^{+}\left(\mathrm{s}\right)}\stackrel{∆}{\to }\underset{\mathrm{Urea}}{{\mathrm{H}}_2\mathrm{N}-\mathrm{CO}-{\mathrm{NH}}_2\left(\mathrm{s}\right)}+\underset{\mathrm{water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}$