Q.1

Triple superphosphate is made by reacting phosphate rock with __________ acid.

  • phosphoric
  • nitric
  • sulphuric
  • hydrochloric
Q.2

Ammonia synthesis reaction is

  • exothermic
  • endothermic
  • autocatalytic
  • none of these
Q.3

Yield of urea can be increased with excess ammonia and higher pressure & temperature, but because of __________ this is normally not done.

  • increased biuret formation
  • high corrosion rate
  • increased cost of equipment
  • all (a), (b) & (c)
Q.4

Maximum nitrogen percentage is in

  • ammonium sulphate.
  • calcium ammonium nitrate.
  • urea.
  • liquid ammonia.
Q.5

__________ is the most suitable fertiliser for paddy.

  • Urea
  • Ammonium sulphate
  • Superphosphate
  • Potassium nitrate
Q.6

Raw materials for urea production are

  • CO2 and N2
  • CO2, H2 and N2
  • NH3 and CO
  • HNO3 and CaCO3
Q.7

__________ is not a fertiliser.

  • Calcium ammonium nitrate
  • Ferrous sulphate
  • Liquid ammonia
  • Ammonium sulphate
Q.8

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

  • Ammonium carbonate
  • Biuret
  • Carbon dioxide
  • Ammonium carbamate
Q.9

Which of the following is the costliest source of hydrogen needed for ammonia manufacture under Indian condition ?

  • Electrolysis of water.
  • Cryogenic removal of H2 from coke oven gas.
  • Steam reforming of naphtha.
  • Natural gas cracking.
Q.10

Conversion achieved in HNO3 synthesis with the use of platinum catalyst is about 95-97%. The rate of formation of nitrogen dioxide from the oxidation of nitric acid is favoured by

  • decreasing the pressure.
  • decreasing the temperature.
  • increasing the temperature.
  • none of these.
Q.11

Sodium tri poly phosphate (STPP) is chemically represented as

  • Na5P3O10
  • Na4P3O8
  • Na3P4O6
  • Na2PO4
Q.12

Urea (a nitrogeneous fertiliser) is produced from carbon dioxide and

  • nitric acid
  • ammonia
  • ammonium nitrate
  • nitric oxide
Q.13

H4P2O7 is the chemical formula of __________ phosphoric acid.

  • pyro
  • ortho
  • meta
  • none of these
Q.14

Ammonium nitrate (is mixed with limestone) is not used as fertiliser as such, because

  • it is hygroscopic and explosive in nature.
  • it is highly acidic in nature.
  • it is a liquid at room temperature.
  • its nitrogen content is very less.
Q.15

Leaching of phosphate rock by strong __________ acid produces phosphoric acid.

  • sulphuric
  • hydrochloric
  • either (a) or (b)
  • neither (a) nor (b)
Q.16

Which fertiliser is made (using coke oven gas) in by products plant of an integrated steel plant ?

  • Urea
  • CAN
  • Ammonium sulphate
  • Superphosphate
Q.17

Ammonium phosphate is a __________ fertiliser.

  • nitrogenous
  • phosphatic
  • complex
  • mixed
Q.18

Which of the following gasifiers can be attached to coal based fertiliser plants ?

  • Lurgi (high pressure) gasifier.
  • Kopper-Totzek gasifier.
  • Gasifier working at 20 atm.
  • Gasifier working at 40 atm.
Q.19

Nitrogen content in ammonium sulphate (a fertiliser) is around __________ percent.

  • 5
  • 20
  • 50
  • 65
Q.20

Which of the following is not a mixed fertiliser ?

  • Nitrophosphate
  • Calcium ammonium nitrate (CAN)
  • Ammonium phosphate
  • None of these
Q.21

Chemical formula of metaphosphoric acid is

  • H3PO4
  • H4P2O7
  • HPO3
  • same as that of pyrophosphoric acid
Q.22

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

  • Potassium
  • Nitrogen
  • Phosphorous
  • Sulphur
Q.23

Oxidation of ammonia is

  • exothermic
  • endothermic
  • non-catalytic
  • autocatalytic
Q.24

Though liquid ammonia itself is a fertiliser (withnitrogen content) yet it is commonly not used as such in a tropical country like India, because it

  • has a pungent smell.
  • vaporises at normal temperature.
  • is toxic and highly corrosive.
  • is in short supply.
Q.25

A nitrogenous fertiliser containsN2. It could be

  • ammonium nitrate.
  • calcium ammonium nitrate (CAN).
  • urea.
  • ammonium chloride.
Q.26

Fusion zone in the electric furnace used for reduction of phosphate rock to elemental phosphorous is maintained at __________ °C.

  • 250-300
  • 500-750
  • 950-1050
  • 1400-1450
Q.27

Formation of ammonium carbamate by reaction of NH3 with CO2 is a/an __________ reaction.

  • catalytic
  • exothermic
  • endothermic
  • reversible
Q.28

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

  • phosphoric acid
  • ammonium phosphate
  • phosphorous
  • superphosphate
Q.29

Liquid ammonia andnitric acid reaction (which produces ammonium nitrate) is

  • exothermic
  • endothermic
  • autocatalytic
  • none of these
Q.30

A fertiliser containsN2. It could be

  • urea
  • liquid NH3
  • ammonium nitrate
  • none of these
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