Q.1

Enzymes are organic catalysts used in the __________ reactions.

  • chemical
  • biochemical
  • photochemical
  • electrochemical
Q.2

Linde process of gas liquefaction employs

  • exchange of heat with colder stream.
  • adiabatic expansion through a throttle valve (Joule-Thomson expansion).
  • adiabatic expansion against a piston or in a turbine.
  • merely compressing the gas beyond its critical pressure.
Q.3

At a given temperature, the equilibrium yield of SO3 obtained from the oxidation of SO2 is proportional to (where, P = pressure of the system )

  • P
  • P
  • P2
  • 1/P
Q.4

Oleum produces fumes of

  • SO2
  • H2SO4
  • SO3
  • SO2 + H2SO4
Q.5

Which of the following is an yellow pigment ?

  • Titanium dioxide
  • Ferrous sulphate
  • Lead chromates
  • Zinc sulphides
Q.6

Catalytic oxidation of toluene produces

  • styrene
  • phenol
  • benzene
  • tri-nitro-toluene
Q.7

The major use of butadiene is

  • as a plasticiser for unsaturated polyester.
  • in the manufacture of synthetic rubber.
  • as an anti-skinning agent in paint.
  • none of these.
Q.8

Portland cement consists mainly of

  • CaO & SiO2
  • SiO2 & Al2O3
  • CaO & Al2O3
  • CaO & Fe2O3
Q.9

In the manufacture of sulphuric acid from elemental sulphur, the following sequence of major operations is followed :

  • furnace → converter → absorber
  • furnace → evaporator → absorber
  • furnace → converter → evaporator
  • converter → furnace → absorber
Q.10

Phenol formaldehyde

  • employs addition polymerisation.
  • employs condensation polymerisation.
  • is a monomer.
  • is an abrasive material.
Q.11

Lime and soda ash are added to water to remove

  • bicarbonates & sulphates of calcium and magnesium.
  • undersirable taste and odour.
  • bacteria.
  • its corrosiveness.
Q.12

Bleaching action of bleaching powder is due to its __________ properties.

  • reducing
  • oxidising
  • disinfecting
  • none of these
Q.13

The most commonly used substance to speed up the sedimentation of sewage is

  • lime
  • sulphuric acid
  • chlorine
  • sodium bisulphite
Q.14

Sucrose is a

  • monosacchride
  • disacchride
  • polysacchride
  • none of these
Q.15

oleum means that inkg oleum, there arekg of

  • SO3 and 80kg of H2SO4.
  • H2SO4 and 80kg of SO3.
  • SO3 for each 100 kg of H2SO4.
  • none of these.
Q.16

SO2 is bubbled through hot sugar cane juice to

  • act as an acidifying agent.
  • increase its concentration.
  • increase the amount of molasses.
  • increase the crystal size.
Q.17

The manufacture of Kraft pulp is done by a/an __________ process.

  • alkaline
  • acidic
  • neutral
  • none of these
Q.18

Antibiotic

  • inhibits/destroys the growth of microorganisms.
  • is used as a pain reliever.
  • is an antimalarial.
  • is an anaesthetic.
Q.19

Starting material for the production of styrene butadiene rubber (SBR) is

  • ethyl alcohol
  • ethylene
  • both (a) & (b)
  • neither (a) nor (b)
Q.20

Which one of the following is not an elastomer ?

  • Polyisoperene
  • Neoprene
  • Nitrile-butadiene
  • None of these
Q.21

Which of the following processes can remove both temporary as well as permanent hardness of water ?

  • Filtration
  • Boiling
  • Distillation
  • None of these
Q.22

Dacron is a

  • condensation product of hexam-ethylene diamine and adipic acid.
  • thermosetting material.
  • condensation product of dimethyl terephthalate and ethylene glycol.
  • none of these.
Q.23

Rancidity of the fatty oil can be reduced by its

  • decoloration
  • hydrogenation
  • oxidation
  • purification
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