Volume of one mole of any gas at NTP is
  • 11.2 litre
  • 22.4 litre
  • 10.2 litre
  • 22.8 litre
Tyndall effect confirms the
  • gravity effect on the sol. particles
  • light scattering by the sol. particles
  • heterogeneous nature of sols.
  • Brownian motion of the sol. particles
Which one of the following is alyophilic colloid?
  • Milk
  • Gum
  • Fog
  • Blood
Which of the following is not correct for enzyme catalysis?
  • The enzyme activity is maximum at optimum pH which is between 5-7
  • Each enzyme is specific for a given reaction
  • The favourable temperature range of enzyme activity is between 25-37°C
  • The enzymatic activity is increased in presence of certain substances.called co-enzymes
Presence of traces of arsenious oxide (As
  • catalytic promoter
  • catalytic poison
  • dehydrating agent
  • drying agent
Shape selective catalysis is a reaction catalysed by
  • zeolite
  • enzymes
  • platinum
  • Ziegler-Natta catalyst
Which of the following types of metals make the most efficient catalyst?
  • Alkali metals
  • Transition metals
  • Inner transition metals
  • Alkaline earth metals
The oxide of nitrogen which acts as a catalyst in lead chamber process is
  • NO
  • N
  • H
  • None of the above
The activity of an enzyme becomes ineffective
  • at low temperature
  • at atmospheric pressure
  • at high temperature
  • in aqueous medium
Which of the following can adsorb larger volume of hydrogen gas?
  • Finely divided platinum
  • Colloidal solution of palladium
  • Small pieces of palladium
  • A single metal surface of platinum
Which of the following gases present in a polluted area will be adsorbed most easily on the charcoal gas mask?
  • H
  • O
  • N
  • SO
Which kind of catalysis can be explained on the basis of adsorption theory ?
  • Homogeneous catalysis
  • Heterogeneous catalysis
  • Negative catalysis
  • Auto catalysis
A colloidal system is which liquid is dispersed phase and solid is dispersion medium is classified as
  • gel
  • sol
  • emulsion
  • aerosol
Which of the following will not form a colloidal system?
  • Solid-gas
  • Liquid-gas
  • Gas-gas
  • Gas-liquid
Fog in an example of colloidal system of
  • liquid in gas
  • gas in liquid
  • solid in gas
  • gas in solid
Substances which behave as normal electrolytes solution at low concentration and exhibit colloids properties at higher concentration are called
  • lyophilic colloids
  • lyophobic colloids
  • macromolecular colloids
  • associated colloids
Which of the following acts as the best coagulating agent for ferric hydroxide sol?
  • Potassium ferrocyanide
  • Potassium chloride
  • Potassium oxalate
  • Aluminium chloride
The formation of micelles takes place only above
  • critical temperature
  • Kraft temperature
  • inversion temperature
  • absolute temperature
At CMC (critical micelle concentration) the surface molecules
  • dissociate
  • associate
  • become bigger in size due to adsorption
  • become smaller in size due to decomposition
Which of the following is not a method for coagulation of lyophobic sols?
  • By electrophoresis
  • By mixing oppositely charged sols
  • By adding electrolyte
  • By adding a protective colloid
0 h : 0 m : 1 s

Answered Not Answered Not Visited Correct : 0 Incorrect : 0