Q.1

NPK means a __________ fertiliser.

  • mixed
  • potassic
  • liquid
  • solid
Q.2

Fertilizer plant getting its hydrogen requirement partly from coke oven gas is situated at

  • Rourkela (under SAIL)
  • Barauni (under HFC)
  • Nangal (under NFL)
  • Talchar (under FCI)
Q.3

Which of the following nitrogenous fertilisers has the highest percentage of nitrogen ?

  • Calcium nitrate
  • Calcium ammonium nitrate (CAN)
  • Urea
  • Ammonium sulphate
Q.4

Nitrolime is

  • calcium nitrate.
  • calcium ammonium nitrate.
  • a mixture of nitric acid and lime.
  • a mixture of ammonium nitrate and calcium nitrate.
Q.5

Nitric acid is produced on commercial scale in a fertiliser plant by

  • oxidation of ammonia.
  • CaNO3 + H2SO4 reaction.
  • passing air through high voltage electric arc.
  • none of these.
Q.6

Nitrolime is chemically known as

  • calcium nitrate
  • ammonium nitrate
  • calcium ammonium nitrate (CAN)
  • none of these
Q.7

Catalytic ammonia synthesis reaction as in Haber's process is

  • endothermic
  • exothermic
  • irreversible
  • none of these
Q.8

Nitrogen content of a nitrogenous fertiliser is 35%. It could be

  • urea
  • ammonium nitrate
  • calcium ammonium nitrate (CAN)
  • ammonium sulphate
Q.9

Ammonium sulphate can be produced by reacting gypsum with

  • ammonia
  • ammonium carbonate
  • nitric acid
  • none of these
Q.10

The concentration (weight %) of nitric acid produced by the oxidation of ammonia and absorption of nitrogen oxides with water is about __________ percent.

  • 60
  • 30
  • 95
  • 100
Q.11

During conversion of ammonium carbamate into urea, presence of large excess of water

  • increases the yield of urea.
  • adversely affects the yield of urea.
  • reduces the evaporator load by diluting the urea solution.
  • does not affect the yield of urea.
Q.12

P2O5 content in triple superphosphate is about __________ percent.

  • 42-50
  • 15-20
  • 85-90
  • 70-75
Q.13

Nitrogenous fertiliser is required

  • during the early stage of growth to promote development of stem and leaves.
  • for accelerating fruit formation in later stage of growth.
  • to lessen the effect of excessive potash application.
  • none of these.
Q.14

Urea is a __________ fertiliser.

  • nitrogenous
  • potassic
  • phosphatic
  • none of these
Q.15

Hydrogen content of coke oven gas is __________ percent.

  • 4
  • 22
  • 58
  • 84
Q.16

H3PO4 is the chemical formula of __________ phosphoric acid.

  • pyro
  • ortho
  • meta
  • none of these
Q.17

Pick out the wrong statement.

  • Yellow phosphorous which is the most reactive allotropic form of phosphorous is transported under water.
  • Apatite is the principal material present in phosphate rock which is chemically Ca10 (PO4)6 (F, Cl, OH).
  • Urea is more hygroscopic than ammonium nitrate.
  • Nitrogen fixation means the process of bringing atmospheric nitrogen into combination i.e. into nitrogen compound form.
Q.18

Prilling tower is found in the flowsheet for the manufacture of

  • ammonia
  • urea
  • superphosphate
  • triple superphosphate
Q.19

Reaction of dilute sulphuric acid with phosphate rock produces

  • phosphoric acid
  • superphosphate
  • triple superphosphate
  • gypsum
Q.20

Ammonium sulphate fertiliser is

  • the highest concentration nitrogenous fertiliser.
  • the best fertiliser for paddy.
  • a basic fertiliser.
  • a neutral fertiliser.
Q.21

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

  • nickel
  • iron
  • vanadium pentoxide
  • alumina
Q.22

Fertiliser plant making ammonium sulphate employing gypsum-ammonia reaction (usual practice is to use ammonia and sulphuric acid) is located at

  • Rourkela (under SAIL)
  • Bokaro (under SAIL)
  • Sindri (under FCI)
  • Baroda (under G.S.F.C.)
Q.23

Calcium ammonium nitrate (CAN) is

  • a mixed fertiliser
  • a straight fertiliser
  • a complex fertiliser
  • not a fertiliser ; it is an explosive
Q.24

Pick out the wrong statement.

  • 'Green acid' is the other name of phosphoric acid produced by the reaction of phosphate rock & sulphuric acid.
  • Chemically unreactive nature of red phosphorous is due to its polymeric structure.
  • Red phosphorous is the most reactive allotropic form of phosphorous.
  • Red phosphorous, which is used in the manufacture of safety matches, is converted into white phosphorous by vaporisation followed by condensation.
Q.25

Phosphorus vapour comprises of

  • P
  • P2
  • P3
  • P4
Q.26

Heating of orthophosphoric acid to 250°C produces

  • metaphosphoric acid
  • pyrophosphoric acid
  • no change in it
  • none of these
Q.27

Which of the following does not come under the category of 'secondary nutrient' for plant growth?

  • Calcium
  • Magnesium
  • Sulphur
  • Oxygen
Q.28

Reaction of orthophosphoric acid with soda ash produces

  • sodium tripolyphosphate (STPP)
  • tricresyl phosphate
  • tributyl phosphate
  • nitrophosphate
Q.29

Phosphoric acid is produced in wet process from phosphate rock and

  • dilute H2SO4
  • concentrated H2SO4
  • concentrated NHO3
  • concentrated HCl
Q.30

Lower temperature and large excess of ammonia in urea melt

  • increases biuret formation
  • decreases biuret formation
  • is undersirable
  • does not effect biuret formation
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