Fertiliser Technology MCQs

Question 1

Prilling of urea should be accomplished (in a sprayer) just above the melting point of urea with minimum of retention time, otherwise it will result in

Accepted Answer

Biuret formation

Answer

Low bulk density product

Answer

Non-spherical prills

Answer

Substantially wet non-flowing and sticky product

Question 2

Urea is a __________ fertiliser.

Accepted Answer

Nitrogenous

Answer

Potassic

Answer

Phosphatic

Answer

None of these

Question 3

Pick out the wrong statement.

Accepted Answer

Red phosphorous is the most reactive allotropic form of phosphorous

Answer

'Green acid' is the other name of phosphoric acid produced by the reaction of phosphate rock & sulphuric acid

Answer

Chemically unreactive nature of red phosphorous is due to its polymeric structure

Answer

Red phosphorous, which is used in the manufacture of safety matches, is converted into white phosphorous by vaporisation followed by condensation

Question 4

Which of the following fertilisers is needed for promoting the development of leaves and stems during early stages of plant growth?

Accepted Answer

Nitrogeneous fertiliser

Answer

Potassic fertiliser

Answer

Phosphatic fertiliser

Answer

None of these

Question 5

__________ is the undesirable by-product produced in the manufacture of urea.

Accepted Answer

Biuret

Answer

Ammonium carbonate

Answer

Carbon dioxide

Answer

Ammonium carbamate

Question 6

In the manufacture of H3PO4 (ortho); strong H2SO4 leaching wet process as compared to electric furnace process

Accepted Answer

Produces lower purity acid

Answer

Uses lower grade phosphate rock

Answer

Requires lower capital investment in the plant

Answer

Is very costly

Question 7

NPK fertiliser is a __________ fertiliser.

Accepted Answer

Mixed

Answer

Complex

Answer

Nitrogenous

Answer

Phosphatic

Question 8

Raw materials for urea production are

Accepted Answer

CO2, H2 and N2

Answer

CO2 and N2

Answer

NH3 and CO

Answer

HNO3 and CaCO3

Question 9

Catalyst used in the manufacture of NH3 by Haber's process is finely divided

Accepted Answer

Iron

Answer

Nickel

Answer

Vanadium pentoxide

Answer

Alumina