Raw materials for urea production are _________________?
(A) CO2 and N2
(B) CO2, H2 and N2
(C) NH3 and CO
(D) HNO3 and CaCO3
Formation of ammonium carbamate by reaction of NH3 with CO2 is a/an ______________ reaction?
(A) Catalytic
(B) Exothermic
(C) Endothermic
(D) Reversible
Fusion zone in the electric furnace used for reduction of phosphate rock to elemental phosphorous is maintained at ______________ °C?
(A) 250-300
(B) 500-750
(C) 950-1050
(D) 1400-1450
A phosphatic fertiliser contains 16% P2O5. It could be________________?
(A) Dicalcium phosphate
(B) Superphosphate
(C) Triple superphosphate
(D) None of these
Reaction of ortho-phosphoric acid with phosphate rock produces _________________?
(A) Superphosphate
(B) Triple superphosphate
(C) Meta-phosphoric acid
(D) Monoammonium phosphate
Biuret formation in urea is kept at minimum (< 1 %), because it is___________________?
(A) Corrosive in nature
(B) Toxic and harmful to some crops
(C) Helpful in decomposition of urea
(D) Explosive in nature
Effectiveness of a fertiliser is independent of the ___________________?
(A) Nature of soil
(B) Type of crop
(C) pH of soil
(D) None of these
Excessive use of chemical fertilisers causes shrivelling of the roots and wilting of the plant, because the__________________?
(A) Osmotic pressure of the soil water becomes less than that of the plant sap
(B) Soil becomes too alkaline
(C) Osmotic pressure of the soil water becomes higher than that of the plant sap
(D) Soil becomes too acidic
During conversion of ammonium carbamate into urea, presence of large excess of water______________?
(A) Increases the yield of urea
(B) Adversely affects the yield of urea
(C) Reduces the evaporator load by diluting the urea solution
(D) Does not affect the yield of urea
Coal based fertiliser plants at Ramagundam (Andhra Pradesh) and Talcher (Orissa) ?
(A) Use coal for heating purpose
(B) Gasify coal to get hydrogen from coal gas
(C) Use coal as filler in fertiliser
(D) Use coal as conditioner in fertiliser