Q.1

Red phosphorous is changed into white phosphorous by

  • heating in presence of light.
  • melting under pressure.
  • vaporisation followed by condensation.
  • none of these.
Q.2

Catalyst used in Haber's process for ammonia production is

  • reduced iron oxide
  • nickel
  • vanadium pentoxide
  • silica gel
Q.3

CO2 present in reformed gas (obtained by steam reforming of naphtha) is removed by absorbing in

  • mono-ethanolamine (MEA)
  • slaked lime
  • ammoniacal liquor
  • Methyl-Ethyl Ketone (MEK)
Q.4

Ammonium nitrate (a fertiliser) is coated with limestone powder to

  • increase its nitrogen content.
  • cut down its production cost.
  • avoid the risk of explosion.
  • add extra nutrient as fertiliser.
Q.5

Action of phosphoric acid on rock phosphate produces

  • superphosphate
  • triple superphosphate
  • nitrophosphate
  • diammonium phosphate
Q.6

Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at __________ °C in absence of air.

  • 50-80
  • 250-400
  • 1000-1200
  • 800-900
Q.7

Commercial fertilisers are available mostly in the form of

  • powder
  • grannules
  • lumps
  • flakes
Q.8

Vapor phase reaction of ammonia & nitric acid to produce ammonium nitrate is termed as the __________ process.

  • Haber's
  • Stengel
  • Le-chatlier's
  • Du-pont's
Q.9

Steam reforming of naphtha is a source of hydrogen production for nitrogeneous fertiliser industry. What is the usual ratio of steam to carbon maintained in the process of steam reforming of naphtha ?

  • 1.5:1
  • 3.5:1
  • 10:1
  • 15:1
Q.10

Urea is formed only

  • in liquid phase
  • in vapour phase
  • at very high temperature
  • at very low pressure (vacuum)
Q.11

Base suspension fertiliser essentially contains

  • 13% N2 and 43% P2O5
  • 43% N2 and 13% P2O5
  • 43% N2 and 13% K2O
  • 43% K2O and 43% P2O5
Q.12

Superphosphate is manufactured by reacting phosphate rock with

  • acetic acid
  • sulphuric acid
  • aluminium chloride
  • none of these
Q.13

Urea is represented as

  • NH2.CO.NH2
  • NH3CO.CH3
  • NH.CO2.NH
  • NH3.CO2.NH3
Q.14

Sodium tri poly phosphate (STPP) is manufactured by reaction of phosphoric acid with sodium

  • carbonate
  • phosphate
  • bicarbonate
  • silicate
Q.15

Which is the most suitable fertiliser for paddy ?

  • CAN
  • Ammonium sulphate
  • Ammonium nitrate
  • Superphosphate
Q.16

Pick out the wrong statement.

  • All the nitrogenous fertilisers are not soluble in water.
  • A straight fertiliser contains only one nutrient.
  • Calcium cynamide is used as weed killer in onion fields.
  • The phosphorous nutrient makes the plant stem stronger and increases its branches.
Q.17

Use of catalyst is a must in the ammonia manufacture, because the reaction is reversible as well as the heat of dissociation of N2 & H2 is high. The presence of promoter along with the catalyst helps in __________ of the catalyst.

  • stabilisation
  • increasing the effectiveness
  • improving the strength & heat resistance
  • all a, b & c
Q.18

(CH3 C6 H4)3 PO4 is the chemical formula of

  • triple superphosphate
  • tricresyl phosphate
  • flourapatite
  • superphosphate
Q.19

Dehydration of ammonium carbamate (to produce urea) is a/an __________ reaction.

  • reversible
  • catalytic
  • exothermic
  • endothermic
Q.20

Conditioners like finely divided peat are added to the fertiliser to

  • counteract burning.
  • avoid caking & hardening.
  • produce bulk.
  • increase its solubility.
Q.21

Vetrocoke solution is

  • a mixture of K2CO3 and As2O3.
  • K2SO4.
  • a mixture of Na2CO3 and As2O3.
  • Na2SO4.
Q.22

In calcium ammonium nitrate (CAN) fertil-ser

  • nitrate nitrogen is quick acting
  • ammoniacal nitrogen is quick acting
  • nitrate nitrogen is slower acting
  • none of these
Q.23

Two gas based fertiliser plants are located in

  • Maharashtra and Gujarat
  • Maharashtra and Orissa
  • Gujarat and Madhya Pradesh
  • Jharkhand and Chattisgarh
Q.24

Ammonia synthesis gas is produced from natural gas by

  • thermal cracking
  • steam reforming
  • partial oxidation
  • hydrogenation
Q.25

Which is a catalyst promoter used in catalytic ammonia synthesis reaction ?

  • Al2O3
  • Cr2O3
  • K2O
  • MnO
Q.26

Electric process as compared to wet process (for the manufacture of phosphoric acid)

  • can use only high grade phosphate rock.
  • is used less frequently.
  • produces a valuable by-product called gypsum.
  • is weak acid process.
Q.27

Liquid ammonia is not used as such a fertiliser in tropical countries like India, because

  • its N2 content is very low.
  • it is very costly.
  • it will evaporate on spraying.
  • it is not available.
Q.28

Fertiliser plants get their N2 requirements

  • by fractionation of liquified air.
  • by dissociating oxides of nitrogen.
  • from coal gas (coke oven gas).
  • from producer gas.
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