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