Ammonia is generally manufactured for fertilizers by the reaction
(a) 2NH4Cl + Ca(OH)2 u200b→ CaCl2 + 2H2O + 2NH3
(b) By passing an electric discharge in a mixture of N2 and H2
(c) By passing a mixture of N2 and H2 under high pressure and moderate temperature over a catalyst
(d) of these
