A. Dehydration of ammonium carbamate to produce urea is endothermic
B. Direct use of liquid ammonia as a fertiliser for a tropical country like India is suitable
C. Gypsum (CaSO4. 2H2O) is obtained as a by-product in the wet process for manufacture of
ortho-phosphoric acid
D. Phosphate rock when reacted with dilute H2SO4 produces superphosphate
A. Yellow phosphorous which is the most reactive allotropic form of phosphorous is transported
under water
B. Apatite is the principal material present in phosphate rock which is chemically Ca10 (PO4)6 (F,
Cl, OH)
C. Urea is more hygroscopic than ammonium nitrate
D. Nitrogen fixation means the process of bringing atmospheric nitrogen into combination i.e.
into nitrogen compound form
A. Loamy soil is the best soil for vigorous plant growth, while the clayey soil is solid and hence
the plant roots penetrate with difficulty
B. Large excess use of nitrogenous fertiliser in land causes the problem of diarrhoea and cyanosis
C. Application of large excess of Potassic fertiliser in soil increases the valuable carotene in
fruits and vegetables
D. Cereal crops grown on alkaline soil absorb higher amount of fluorides thereby spreading
fluorosis