C-12-Q171mediumsingle_mcqThe reaction NH2COONH4→NH2-CO-NH2+H2O\mathrm{NH_2COONH_4 \rightarrow NH_2\text{-}CO\text{-}NH_2 + H_2O}NH2COONH4→NH2-CO-NH2+ is the—afirst step of urea synthesisbfinal step that gives ureacpreparation of ammonium sulphatedpreparation of melamine