Fertiliser Technology MCQs

Question 1

Pick out the wrong statement.

Accepted Answer

Urea is more hygroscopic than ammonium nitrate

Answer

Yellow phosphorous which is the most reactive allotropic form of phosphorous is transported under water

Answer

Apatite is the principal material present in phosphate rock which is chemically Ca10(PO4)6(F, Cl, OH)

Answer

Nitrogen fixation means the process of bringing atmospheric nitrogen into combination i.e. into nitrogen compound form

Question 2

Ammonium sulphate fertiliser is

Accepted Answer

The best fertiliser for paddy

Answer

The highest concentration nitrogenous fertiliser

Answer

A basic fertiliser

Answer

A neutral fertiliser

Question 3

Chemical formula of metaphosphoric acid is

Accepted Answer

HPO3

Answer

H3PO4

Answer

H4P2O7

Answer

Same as that of pyrophosphoric acid

Question 4

Heating a mixture of phosphate rock, coke and sand in an electric furnace produces

Accepted Answer

Phosphorous

Answer

Phosphoric acid

Answer

Ammonium phosphate

Answer

Superphosphate

Question 5

In the manufacture of orthophosphoric acid by strong H2SO4 leaching wet process, keeping the reactor temperature above 100°C, results in the formation of undesriable

Accepted Answer

CaSO4.$$\frac{1}{2}$$H2O and CaSO4 crystals

Answer

Pyrophosphoric acid

Answer

Metaphosphoric acid

Answer

All of the above

Question 6

Which of the following is a natural inorganic fertiliser?

Accepted Answer

Chile salt petre

Answer

Oilcake

Answer

Gobar mannure

Answer

None of these

Question 7

Which of the following solvents is used for the extraction of H3PO4 from CaCl2 solution during manufacture of ortho-phosphoric acid by wet process employing hydrochloric acid leaching?

Accepted Answer

Butyl alcohol

Answer

Iso propyl alcohol

Answer

Toluene

Answer

Hexane

Question 8

Which of the following is not a mixed fertiliser?

Accepted Answer

Calcium ammonium nitrate (CAN)

Answer

Nitrophosphate

Answer

Ammonium phosphate

Answer

None of these

Question 9

Red phosphorous is changed into white phosphorous by

Accepted Answer

Vaporisation followed by condensation

Answer

Heating in presence of light

Answer

Melting under pressure

Answer

None of these