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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