Use of catalyst is a must in the ammonia manufacture, because the reaction is reversible as well as the heat of dissociation of N₂ & H₂ is high. The presence of promoter along with the catalyst helps in __________ of the catalyst.

A. Metaphosphoric acid B. Pyrophosphoric acid C. No change in it D. None of these

A. Potassium sulphate B. Potassium chloride C. A mixture of NaCl + KCl D. None of these

A. Its N₂ content is very low B. It is very costly C. It will evaporate on spraying D. It is not available

A. Urea B. CAN C. Ammonium sulphate D. Calcium cyanamide