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ECAT Chemistry Chapter 11 Reaction Kinetics Online Test MCQs With Answers
Question # 1
The rate of reaction is denoted by
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dc/dp
dc/ac
dc/dT
dc/dt
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Question # 2
The rate of reaction b/w two specific time intervals is called :
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Instantaneous rate of reaction.
Average rate of reaction.
Rate of a reaction.
Minimum rate of a reaction.
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Question # 3
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Zero
253 sec
150 sec
500 sec
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Question # 4
When we perform the same reaction by taking two different initial concentrations of a reactant for a second order reaction then
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Reaction becomes exothermic
Energy of activation is different
Mechanism of reaction is changed
Half life period is changed
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Question # 5
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Measuring pH
Measuring density
Titration against standard NaOH
Titration against standard KMnO
4
solution
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Question # 6
The experimental relationship between a reaction rate and the concentration of reactants is called
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Order or reaction
Rate law
Activated complex
Molecularity
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Question # 7
The addition of a catalyst to a reaction changes the
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Enthalpy
Entropy
Nature of reactants
Energy of activation
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Question # 8
The unit of rate constant K is
mole
-1
dm
3
for a chemical reaction, the order of reaction is :
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Order of reaction can determined by an experiment
Order of reaction can determined from a balance equation only.
Order of reaction can determined increases by increasing temperate.
Order of reaction must be in whole number and not in fraction.
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Question # 9
Which one of the following reaction rate is effected by the light
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Question # 10
To determine the rate of reaction chemically a graphical method is applied. A graph is plotted between the amount or reactant decomposed or product formed against the time. The rate d
x
/d
t
at any time is equal to
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k
Tangent
θ
1/a, a is initial conc.
1/a
2
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Question # 11
Which statement is not correct
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Enzymes catalyst a specific reaction
Enzymes show catalytic activity at a specific temperature
The catalytic activity of enzymes is stopped if optimum pH is changed
The catalytic activity is poisoned by a co-enzymes
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Question # 12
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Diastase
Lipase
Inverters
Zymase
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Question # 13
When the rate of reaction is entirely independent of the conc. of reaction molecules then order of reaction is
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Zero
First
Second
Third
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Question # 14
Dilatometric method is used for rate determination when
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Reactions involving change of optical
Reactions involving change of optical activity
Reactions involving small volume change
None of above
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Question # 15
For effective collisions the molecules slow down before collision and their kinetic energy decreases which results in increase in their
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Activation energy
Average energy
Potential energy
Collisions frequency
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Question # 16
The chemical method used for determination of rate of reaction is
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Spectroscopic
Conductiometric
Refractometric
Titration
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Question # 17
The rate of reaction :
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Decreases as the reaction proceeds
Increases as the reaction proceeds
May decrease or increase reaction proceeds
Remains same as the reaction proceeds
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Question # 18
With increases in temperature of 10 K of the reacting gases the rate of reaction is doubled because
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Increase in number of collisions
Number of molecules having energy more than Ea is doubled
Increase in order of reaction
Increase in surface area
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Question # 19
The rate determining step is the :
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Slowest step.
Fastest step.
Moderate step.
Both (a) and (b).
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Question # 20
The sum of the exponents of the conc. terms in the rate equation is called
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Rate of reaction
Order of reaction
Specific rate constant
Average rate
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Question # 21
The unit of rate constant k is the same as that of the rate of reaction in
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First order reaction
Second order reaction
Third order reaction
Zero order reaction
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Question # 22
If a reactant or product of a reaction absorbs radiation, then physical method for determining the rate of reaction is
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Spectrometry
Refractometry
Conductivity measurement
Optical method
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Question # 23
In zero order reaction, the rate is independent of :
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Temperature of reaction
Concentration ofreactants
Concentration of products
None of these.
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Question # 24
All reactions occur in :
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A single step.
A series of steps
Two steps.
Both (a) and (b)
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Question # 25
If the rate of reaction is independent of the concentration of the reactant, the reaction is of
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Zero order
First order
Second order
Third order
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Question # 26
Which of the following is not affected by light
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Question # 27
In the reaction of oxalic acid with KMnO
4
and H
2
SO
4
is slow at the beginning but after sometimes the reaction becomes faster due to
Choose an answer
Formation of MnSO
4
which acts as 'Auto catalyst
Formation of CO
2
which acts as 'Auto catalyst
Formation of K
2
SO
4
which acts as 'Auto catalyst
Evolution of O
2
gas which acts as 'Auto catalyst
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Question # 28
It rate law of an equation is written as
dx/dt=K[A][B] ?
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Reaction is independent of the concentration of A and B.
Product is decreasing with passage of time.
Reactant in increasing with passage of time.
Reactant is increasing with passage of time.
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Question # 29
The factor which effect the rate of reaction
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Nature of reactants
Surface area
Light
All of the above
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Question # 30
The catalytic activity of Pt is much higher when
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It is mixed with asbestos
It is mixed with Pd
It is mixed with arsenic
In is made colloidal platinum
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Question # 31
Half life period of a first order reaction is independent of:
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Presence of catalyst.
Conditions of temperature
Initial concentration of the compound
All of above
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