Steam reforming of naphtha is a source of hydrogen production for nitrogeneous fertiliser industry. What is the usual ratio of steam to carbon maintained in the process of steam reforming of naphtha?

Heating of orthophosphoric acid to about 900°C, produces

A. Metaphosphoric acid

B. Pyrophosphoric acid

C. No change in it

D. None of these

A potassic fertiliser contains 50% K₂O. It could be

A. Potassium sulphate

B. Potassium chloride

C. A mixture of NaCl + KCl

D. None of these

Liquid ammonia is not used as such a fertiliser in tropical countries like India, because

A. Its N₂ content is very low

B. It is very costly

C. It will evaporate on spraying

D. It is not available

Which one of the following is used as a nitrogenous fertiliser, as a weed killer in the onion fields and for correcting acidic soils?

A. Urea

B. CAN

C. Ammonium sulphate

D. Calcium cyanamide