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Catalyst And Catalysis
Quiz 1
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Q.1
How does a catalyst increase the speed of a reaction?
By providing alternative pathway with lower Ea
By holding the reactants in the right orientation
By changing the position of the equilibrium
Both A & B
Q.2
What do you require for a successful reaction to occur?
Collision of reactant particles
Particles have enough energy to overcome Ea
High activation energy barrier
Both A & B
Q.3
A catalyst changes the mechanism of the reaction
True
False
Q.4
A catalyst be regenerated or used again and again
False
True
Q.5
A catalyst
is used up
is nevr used up
Q.6
When a catalyst is added to a reaction the rate of reaction,,,
Increases
Decreases
Does not change
All of above
Q.7
A catalyst increases the efficiency of collisions between reactants.
true
false
Q.8
Catalysts permit reactions to proceed along a ___________energy path.
lower
higher
Q.9
A substance that increases the rate of a reaction without being used up during the reaction is called a
catalyst
product
reactant
solute
Q.10
The minimum amount of energy needed for colliding particles to react is called the
Chemical Energy
Kinetic Energy
Activation Energy
Potential Energy
Q.11
The number of active centers are increased by
catalyst
catalytic poison
activators
inhibitors
Q.12
Which of the following is incorrect for a catalyst?
Bio-chemical reactions are mostly catalysed by enzymes
Catalyst does not start a reaction
Catalyst changes the equilibrium constant of a reaction
Co-enzymes increase the activity of an enzyme
Q.13
In ester hydrolysis, initally, the rate of the reaction is very slow. But after some time the rate increases because of presence of
ester
water
acetic acid
HCl
Q.14
Catalytic poison in contact process
Pt
As2O3
Fe
H2S
Q.15
Surface of the catalyst must be
smooth
evenly spread out
cracks and peaks
none of the above
Q.16
Which one of the following is not an example for heterogenous catalysis?
Hydrogenation of oil
Manufacture of ammonia by Haber's process
Manufacture of sulphuric acid by Contact process
Hydrolysis of sucrose in presence of dilute hydrochloric acid
Q.17
Which of the following is used as a catalyst in the haber process?
V2O5
Fe
Ag2O
SO3
Q.18
Which of these are the best choice of catalysts?
Expensive and reusable
Cheap and insensitive to impurities
Cheap and easily poisoned
Cheap and reusable
Q.19
In heterogeneous catalysis, reactants and catalysts are in a __________ phase with each other
Different
Same
Q.20
In homogeneous catalysis, reactants and catalysts are in the ___________ phase with each other.
Different
Same
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