Q.1

Potassic fertilisers

  • are useful during early stage of the plant growth.
  • stimulate early growth and accelerate seeding.
  • help in development of starches of potatoes and grain.
  • none of these.
Q.2

Which of the following fertilisers contains the least percentage of nitrogen?

  • Liquid ammonia
  • Urea
  • Ammonium phosphate
  • Ammonium sulphate
Q.3

Fauser Monte Catini converter is used for

  • ammonia synthesis (e.g. at FCI Sindri).
  • methanation of CO and CO2.
  • shift conversion (i.e. CO to CO2).
  • none of these.
Q.4

Ammonium nitrate is

  • having about 40% N2.
  • not hygroscopic.
  • not prone to explosive thermal decomposition.
  • mixed with limestone powder to reduce its explosive nature before using it as a fertilizer.
Q.5

Tricresyl phosphate is chemically represented as

  • (CH3 C6 H4)3 PO4
  • Ca10(PO4)3F6
  • (NH4)2HPO4
  • NH4H2PO4
Q.6

Which one of the following is used as a nitrogenous fertiliser, as a weed killer in the onion fields and for correcting acidic soils ?

  • Urea
  • CAN
  • Ammonium sulphate
  • Calcium cyanamide
Q.7

Plant tranquillisers

  • hold back stem growth and halt plants at a desired height.
  • cause early maturation of plants.
  • accelerate ripening of food and grain.
  • produce seedless fruit.
Q.8

Dehydration of ammonium carbamate to yield urea is a/an __________ reaction.

  • exothermic
  • endothermic
  • autocatalytic
  • catalytic
Q.9

An increase in the NH3/CO2 ratio in urea manufacture results in

  • increased degree of conversion of CO2 to urea.
  • decreased degree of conversion of NH3 to urea.
  • decreased yield of urea.
  • decreased specific volume of molten mass.
Q.10

P2O5 percentage in the phosphoric acid produced by wet process is about

  • 10
  • 30
  • 50
  • 70
Q.11

Ammonia synthesis gas is produced from fuel oil by

  • steam reforming
  • hydrocracking
  • partial oxidation
  • hydrogenation
Q.12

The main constituent of rock phosphate is

  • mono-calcium phosphate
  • di-calcium phosphate
  • fluorspar
  • none of these
Q.13

In the manufacture of H3 PO4 (ortho), ; strong H2 SO4 leaching wet process as compared to electric furnace process

  • uses lower grade phosphate rock.
  • requires lower capital investment in the plant.
  • produces lower purity acid.
  • is very costly.
Q.14

During nitric acid manufacture, catalytic oxidation of ammonia at 800°C in presence of platinum catalyst produces nitrogen oxide. Conversion of NH3 to NO is about __________ percent.

  • 38
  • 68
  • 82
  • 98
Q.15

Phosphatic fertiliser is graded based on its __________ content.

  • P2O3
  • PCl5
  • P2O5
  • H3PO4
Q.16

Urea is a better fertilizer than ammonium sulphate, because

  • it is cheaper.
  • nitrogen content is higher.
  • it is not poisonous.
  • it is easy to manufacture.
Q.17

Reaction of cresylic acid with __________ produces tricresyl phosphate.

  • phosphorous pentoxide
  • phosphorous oxychloride
  • ammonium phosphate
  • calcium phosphate
Q.18

Steam reforming of naphtha produces ammonia synthesis gas. This is a/an __________ process.

  • autocatalytic
  • endothermic
  • exothermic
  • non-catalytic
Q.19

__________ catalyst is used in the production of urea from CO2 and NH3.

  • Vanadium pentoxide
  • No
  • Alumina
  • Nickel
Q.20

Triple superphosphate which contains aboutP2O5 is produced by the reaction of phosphate rock with ortho phosphoric acid of____percent concentration.

  • 25-28
  • 52-54
  • 75-80
  • > 98
Q.21

A fertiliser plant is classified as a gas based fertiliser plant, when it uses __________ gas as a source of hydrogen for the manufacture of ammonia.

  • coke oven
  • producer
  • natural
  • coal
Q.22

Though kinetics of ammonia synthesis dictates the use of low temperature for high equilibrium conversion, yet it is kept moderately high (550°C), because at low temperature

  • rate of reaction is very low.
  • very high pressure is required resulting in costly pressure vessel.
  • space velocity of gas is very low resulting in decreased conversion.
  • none of these
Q.23

Iron is not used alone as a catalyst in ammonia synthesis, because

  • its activity declines rapidly, if heated to above 520°C.
  • it decomposes ammonia.
  • it gets oxidised above 500°C.
  • none of these.
Q.24

Out of the following, N2 content is minimum in

  • urea
  • ammonium nitrate
  • ammonium sulphate
  • ammonium chloride
Q.25

Which of the following is not a measure component necessarily to be present in fertilisers?

  • Nitrogen
  • Potassium
  • Phosphorous
  • Sulphur
Q.26

In the manufacture of urea, the intermediate chemical formed is

  • biuret
  • ammonium carbamate
  • ammonium carbonate
  • none of these
Q.27

With increases in pressure, the conversion of ammonium carbamate into urea

  • increases
  • decreases
  • remains unaltered
  • can either increase or decrease depends on biuret content
Q.28

Raw materials for nitric acid manufacture are

  • hydrogen peroxide, air and water.
  • anhydrous ammonia and air.
  • anhydrous ammonia, air and water.
  • wet ammonia, air and water.
Q.29

5-10-5 fertilisers mean that they contain

  • 5, 10, 5% respectively of N2, P2O5 and K2O.
  • only 5 to 10% active fertiliser constituents.
  • 5 to 10% filler & carrier of soil conditioners.
  • none of these.
Q.30

Color of nitric acid is light yellow due to the presence of

  • NO
  • NO2
  • N2H5
  • NH3
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