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ECAT Chemistry Chapter 11 Reaction Kinetics Online Test MCQs With Answers
Question # 1
If the rate equation of a reaction 2A+B-------->Products is , Rate = K[A] [B], and A is present in large excess, then order of reaction is :
Choose an answer
1
2
3
Above
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Question # 2
If the rate of decay of radioactive isotope decreases from 200 cpm to 25 cpm after 24 hours, what is its half life :
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8 hours
6 hours
4 hours
3 hours
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Question # 3
Half life period of a reaction is inversely proportion to the initial concentration of the reactant, then order of reaction is
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Third order
Second order
Fist order
Zero order
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Question # 4
The value of activation energy Ea of a reaction can be determined from the value of slope of the straight line obtained by plotting a graph between 1/T and log k. the value of Ea is equal to
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Slope
1/Slope
Slope x R
Slope x 2.303 R
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Question # 5
With the progressive of the reaction the slope of the curve between concentration of product and time
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Gradually becomes more steep
Gradually becomes less steep
No change occurs in slope
None of these occurs
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Question # 6
Refrectrometric method is used when
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Reactions involving absorption of I.R. or U. V
Reactions involving change of refractive index
Reactions involving ions
Change of optical activity
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Question # 7
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Zero
1
2
1.5
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Question # 8
The chemical method used for determination of rate of reaction is
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Spectroscopic
Conductiometric
Refractometric
Titration
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Question # 9
In the manufacture of NH
3
by Haber's process catalyst used is iron its catalytic efficiency is poisoned by
Choose an answer
Presence of Al
2
O
3
Presence of Cr
2
O
3
MnO
2
CO present with H
2
gas
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Question # 10
The experimental relationship between a reaction rate and the concentration of reactants is known as
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Order
Molecularity
Rate constant
Rate law
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Question # 11
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 # 12
Half life period of N
2
O
5
is 24 minutes and it remains same where we increase or decrease its initial concentration, then reactions
Choose an answer
Zero order
First order
Second order
Third order
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Question # 13
Complex protein molecules which catalyses the organic reactions in the living cells are called
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Living organisms
Enzymes
Viruses
Bacteria
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Question # 14
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 # 15
The actual number of atoms or molecules taking part in rate determining step is
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Rate of reaction
Velocity of reaction
Order of reaction
Molecularly
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Question # 16
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 # 17
A white precipitate
of
silver
chloride
immediately formed on
addition
of :
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Silver nitrate solution to sodium chloride solution.
Silver chloride solution to sodium nitrate solution.
Silver nitrate solution to potassium chloride solution
Silver nitrate solution to hydrogen chloride solution.
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Question # 18
The reaction rate is expressed in the units of
Choose an answer
mol dm
-3
S
-
mol dm
-3
mol dm
-3
N
-
dm
-3
S
-
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Question # 19
Rate law of an equation is obtained :
Choose an answer
From a balance equation.
Can be calculated theoretically as well as determined experimentally.
It is only calculated theoretically.
Experimentally.
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Question # 20
The effective activity of a metal catalyst is increased if it is in
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Solid form
Liquid state
Gaseous state
Finely divided form
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Question # 21
Value of rate constant k is specific for a reaction, and varies from reaction to reaction. The value of k of a reaction changes with
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Time
Temperature
Concentration of reactants
Order of reaction
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Question # 22
Activation energy is the difference of energy between the energy of the reactant and
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The product
The activated complex
Both a and b
None of these
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Question # 23
Which of the following may affect the rate constant (k) fro a reaction :
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Change in concentration.
Change in pressure.
Change in pH.
Change in temperature.
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Question # 24
It rate law of an equation is written as
dx/dt=K[A][B] ?
Choose an answer
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 # 25
A substance which increases the rate of a reaction without being consumed during the reaction is called
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An autocatalyst
A catalyst
A negative catalyst
All of these
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Question # 26
The reaction rate is expressed in the units of
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Mol dm
-3
S
-
Mol dm
-3
Mol dm
-3
N
-
dm
-3
S
-
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Question # 27
Choose an answer
2
3
4
9
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Question # 28
Which statement about Arrhenius equation is incorrect
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Factor 'A' called Arrhenius constant depends upon collision frequency of reactants
Rate of reaction increase by increasing temperature
Rate constant k is increased
Activation energy Ea is decreased by rise in temperature
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Question # 29
In thermal decomposition of N
2
O the half life period for two different initial concentrations of N
2
O are
(i) 255 second for initial N
2
O 290 mm Hg
(ii) 212 second for initial N
2
O 360 mm Hg then it is
Choose an answer
Zero order
First order
Second order
Third order
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Question # 30
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Zero
253 sec
150 sec
500 sec
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Question # 31
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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