Email
Chat with tutors
Login
Ask Questions, Get Answers
Menu
X
home
ask
tuition
questions
practice
papers
mobile
tutors
pricing
X
Recent questions in Chemical Kinetics
Questions
>>
JEEMAIN and NEET
>>
Chemistry
>>
Chemical Kinetics
The decomposition of hydrogen bromide into hydrogen and iodine is second order reaction.The reaction rate constant is
K
=
0.08
L
m
o
l
−
1
s
−
1
.How long it take an initial concentration of 0.04M to decrease to half this concentration?
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
half-life
difficult
asked
Dec 18, 2013
by
sreemathi.v
1
answer
At
150
o
C
the decomposition of acetaldehyde to methane is first order reaction. If rate constant for reaction at
750
o
C
is
0.05
m
−
1
, how long does it take a concentration of
0.04
m
o
l
L
−
1
of acetaldehyde to reduce concentration of
0.03
m
o
l
L
−
1
?
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
medium
asked
Dec 18, 2013
by
sreemathi.v
1
answer
What is the rate constant for a reaction of
(
C
H
3
)
3
C
B
r
with water is represented below :
C
H
3
)
3
C
B
r
+
H
2
O
→
(
C
H
3
)
3
C
O
H
+
H
B
r
where the following data was obtained experimentally:
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
medium
asked
Dec 18, 2013
by
sreemathi.v
1
answer
If a reactant is used up according to a first order rate equation and initial concentration of reactant is
32
m
o
l
L
−
1
what is concentration of reactant after six half lives have passed?
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
half-life
concentration
easy
asked
Dec 18, 2013
by
sreemathi.v
1
answer
Consider the following reaction:- <p> Step (i):
H
2
O
2
+
I
−
→
H
2
O
+
I
O
−
, </p> <p> Step (ii):
H
2
O
2
+
I
O
−
→
H
2
O
+
O
2
+
I
−
, </p> then reaction intermediate will be
reaction-mechanisms
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
medium
asked
Dec 18, 2013
by
sreemathi.v
1
answer
Addition of catalyst to reaction increases the rate because it
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
effect-of-catalyst
basics
easy
asked
Dec 18, 2013
by
sreemathi.v
1
answer
Which one of following changes would result in greatest increase in reaction rate in the following two-step mechanism?
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
reaction-mechanisms
medium
asked
Dec 18, 2013
by
sreemathi.v
1
answer
Consider following reactions :(i)
H
2
(
g
)
+
I
2
(
g
)
→
2
H
I
(
g
)
,
(
i
i
)
2
M
g
(
s
)
+
O
2
(
g
)
→
2
M
g
O
(
s
)
,
(
i
i
i
)
C
a
C
O
3
(
s
)
+
2
H
+
(
a
q
)
→
C
a
+
2
(
a
q
)
+
H
2
O
(
l
)
+
C
O
2
(
g
)
.When we increase surface area will increase reaction rate in
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
surface-area
effect-of-catalyst
medium
asked
Dec 18, 2013
by
sreemathi.v
1
answer
For following potential energy diagram : True statement is :-
jeemain
chemistry
class12
ch4
chemical-kinetics
effect-of-catalyst
easy
physical-chemistry
activation-energy
asked
Dec 18, 2013
by
sreemathi.v
1
answer
The rates in order of fastest to slowest for this reaction: a 5g of powdered
M
g
(
s
)
+
2
H
C
l
(
a
q
)
→
M
g
C
l
2
(
a
q
)
+
H
2
(
g
)
are:
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
temperature-dependence
easy
asked
Dec 18, 2013
by
sreemathi.v
1
answer
Consider the following reaction:
1
2
H
2
(
g
)
+
1
2
C
l
2
(
g
)
→
H
C
l
(
g
)
Δ
H
=
20
K
J
.The activation energy for formation of HCl is 150KJ.Then activation energy for decomposition of HCl will be
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
activation-energy
easy
asked
Dec 18, 2013
by
sreemathi.v
1
answer
Consider following potential energy graph
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
activation-energy
medium
asked
Dec 17, 2013
by
sreemathi.v
1
answer
The variation of PE & KE as reactant molecules approach each other can be represented by
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
activation-energy
medium
basics
asked
Dec 17, 2013
by
sreemathi.v
1
answer
Which of following corresponds to faster reaction at room temperature? (y-axis is Potential Energy and x-axis is Progress of reaction).
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
activation-energy
basics
easy
asked
Dec 17, 2013
by
sreemathi.v
1
answer
An activated complex has
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
activation-energy
medium
basics
asked
Dec 17, 2013
by
sreemathi.v
1
answer
An increase in temperature increases the rate of a chemical reaction because
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
basics
temperature-dependence
easy
asked
Dec 17, 2013
by
sreemathi.v
1
answer
If for same temperature we consider the following two reactions, then Collision I is successful and II is not because of what?
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
collision-theory
medium
asked
Dec 17, 2013
by
sreemathi.v
1
answer
Choose the correct option below based on the following statement:
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
temperature-dependence
basics
easy
asked
Dec 17, 2013
by
sreemathi.v
1
answer
Which of following are necessary for successful collisions to occur? </br> (i) Favourable collision geometry </br> (ii) sufficient kinetic energy </br> (iii) Large
Δ
H
</br>
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
collision-theory
basics
easy
asked
Dec 17, 2013
by
sreemathi.v
1
answer
The photochemical reactions are those which
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
easy
basics
asked
Dec 17, 2013
by
sreemathi.v
1
answer
Consider the following reaction :
N
a
O
H
(
a
q
)
+
H
C
l
(
a
q
)
→
H
2
O
(
l
)
+
N
a
C
l
(
a
q
)
.The rate of reaction can be found by observing change in concentration
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
easy
asked
Dec 17, 2013
by
sreemathi.v
1
answer
Consider the statement: Solid Mg added to 2M HCl. In the first 10 seconds,the temperature of container increased by
1
0
C
and 20ml of
H
2
was produced. Determine rate of reaction.
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
easy
asked
Dec 17, 2013
by
sreemathi.v
1
answer
In the following reaction and graph:
2
H
2
O
2
(
l
)
→
2
H
2
O
2
+
O
2
(
g
)
, he average rate of reaction is greatest in which time period?
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
medium
gaphs
asked
Dec 17, 2013
by
sreemathi.v
1
answer
Consider the following reaction;
2
H
2
O
2
(
l
)
→
2
H
2
O
(
l
)
+
O
2
(
g
)
which graph shows the relation between rate of consumption of
H
2
O
2
and time?
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
medium
graphs
asked
Dec 17, 2013
by
sreemathi.v
1
answer
The rate of chemical equation is equal to slope of graph with ones labelled
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
easy
basics
asked
Dec 17, 2013
by
sreemathi.v
1
answer
Ammonia can be oxidized by oxygen to produce
N
O
2
according to reaction
4
N
H
3
+
7
O
2
→
4
N
O
2
+
6
H
2
O
.If water is formed of
36
m
o
l
L
−
1
m
i
n
−
1
.Then respective rates of
N
H
3
,
O
2
used will be(in M/min)
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
easy
asked
Dec 17, 2013
by
sreemathi.v
1
answer
For the reaction
A
k
1
→
B
k
2
→
C
, select the correct statement:
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
reaction-mechanism
consecutive-reactions
medium
asked
Dec 17, 2013
by
sreemathi.v
1
answer
A first order reaction is 50% completed in 45 minute at
87
o
C
and in 9minutes at
127
o
C
.The energy of activation of the reaction is
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
medium
activation-energy
asked
Dec 17, 2013
by
sreemathi.v
1
answer
The decomposition of
N
2
O
5
is a first order reaction represented by
N
2
O
5
→
N
2
O
4
+
1
2
O
2
.After 15minutes the volume of
O
2
produced is 9ml & at the end of the reaction 35ml.The rate constant is equal to
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
rate-constant
asked
Dec 16, 2013
by
sreemathi.v
1
answer
What is the unit of k of a
n
t
h
order reaction?
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
rate-constant
basics
medium
asked
Dec 16, 2013
by
sreemathi.v
1
answer
What is the rate of the reaction
A
+
B
→
C
based on the following experiments:
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
medium
asked
Dec 16, 2013
by
sreemathi.v
1
answer
If a reaction is catalyzed by
x
, then
x
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
effect-of-catalyst
general-characteristics
easy
basics
asked
Dec 16, 2013
by
sreemathi.v
1
answer
The catalyst increases the rate of reaction because it
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
effect-of-catalyst
general-characteristics
easy
basics
asked
Dec 16, 2013
by
sreemathi.v
1
answer
For the parallel reactions depicted below, which of the following options are correct?
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
reaction-mechanisms
medium
parallel-reactions
asked
Dec 16, 2013
by
sreemathi.v
1
answer
For the given sequential reaction
A
k
1
→
B
k
2
→
C
the concentration of A,B & C at any time 't' is given by
[
A
]
t
=
[
A
]
o
e
−
k
1
t
;
[
B
]
t
=
k
1
[
A
o
]
k
2
−
k
1
[
e
−
k
1
t
−
e
−
k
2
t
]
;
[
C
]
t
=
[
A
o
]
−
(
[
A
]
t
−
(
[
A
]
t
+
[
B
]
t
)
.The time at which a concentration of B is maximum is
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
concentration
easy
asked
Dec 16, 2013
by
sreemathi.v
1
answer
For the given sequential reaction
A
k
1
→
B
k
2
→
C
the concentration of A,B & C at any time 't' is given by
[
A
]
t
=
[
A
]
o
e
−
k
1
t
;
[
B
]
t
=
k
1
[
A
o
]
k
2
−
k
1
[
e
−
k
1
t
−
e
−
k
2
t
]
;
[
C
]
t
=
[
A
o
]
−
(
[
A
]
t
−
(
[
A
]
t
+
[
B
]
t
)
.The maximum concentration of
[
B
]
is
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
concentration
difficult
asked
Dec 16, 2013
by
sreemathi.v
1
answer
For a first order reaction
A
→
2
B
,graph for
d
[
B
]
d
t
vs
−
d
[
A
]
d
t
is
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
first-order-reactions
easy
asked
Dec 16, 2013
by
sreemathi.v
1
answer
Consider the following first order completing reactions :
X
k
1
⟶
A
+
B
and
Y
k
2
⟶
C
+
D
if
50
%
of the reaction of
X
was completed when
87.5
%
of the reaction of
Y
was completed , the ratio of their constants
(
k
1
/
k
2
)
is
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
rate-constant
easy
asked
Dec 16, 2013
by
sreemathi.v
1
answer
For the reaction
A
→
B
the rate law expression
−
d
[
A
]
d
t
=
k
[
A
]
1
/
2
.Select the correct statement:
jeemain
chemistry
unit9
chemical-kinetics
q42
medium
asked
Dec 16, 2013
by
sreemathi.v
1
answer
For the reaction
A
→
B
,the rate law expression is
−
d
[
A
]
d
t
=
k
[
A
]
3
/
2
. If the initial concentration of
A
is
[
A
]
0
, which of the following is true?
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
medium
asked
Dec 16, 2013
by
sreemathi.v
1
answer
For reaction
C
+
D
→
A
+
B
,the rate expression is rate=
k
[
C
]
1
/
2
[
D
]
1
/
2
starting with initial concentration of 4M of C and D each,what is time taken for concentration of A to become 0.25M.Given :
k
=
2.303
×
10
−
2
s
e
c
−
1
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
medium
asked
Dec 16, 2013
by
sreemathi.v
1
answer
For first order decomposition reaction,
A
(
g
)
→
B
(
g
)
rate of formation of B against time t will be:
jeemain
chemistry
unit9
chemical-kinetics
q39
medium
asked
Dec 16, 2013
by
sreemathi.v
1
answer
Select the correct statement:
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
activation-energy
general-characteristics
easy
basics
asked
Dec 16, 2013
by
sreemathi.v
1
answer
Which of the following is correct expression for an irreversible nth order reaction?
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
order-of-a-reaction
medium
asked
Dec 16, 2013
by
sreemathi.v
1
answer
Given the following parallel reactions, where
k
1
k
2
=
1
3
. Initially only 4 moles of A are present. The total number of moles of C at the end of 50% reaction is:
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
parallel-reactions
easy
asked
Dec 16, 2013
by
sreemathi.v
1
answer
Given the following parallel reactions, where
k
1
k
2
=
1
3
. Initially only 4 moles of A are present. The total number of moles of A,B & C at the end of 50% reaction is:
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
parallel-reactions
medium
asked
Dec 16, 2013
by
sreemathi.v
1
answer
Rate of reaction can be expressed by Arrhenius equation as
k
=
A
e
−
E
a
R
T
.Select the correct statement
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
basics
easy
temperature-dependence
arrhenius-equation
asked
Dec 16, 2013
by
sreemathi.v
1
answer
The rate law for a reaction
A
→
B
is rate=
K
[
A
]
m
[
B
]
n
.On tripling the concentration of A and halving the concentration of B,the ratio of new rate to the earlier rate of the reaction will be as
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
easy
asked
Dec 16, 2013
by
sreemathi.v
1
answer
The rate constant for a first order reaction is
20
h
r
−
1
.The half life of the reaction will be
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
half-life
easy
asked
Dec 16, 2013
by
sreemathi.v
1
answer
In a first order reaction,the concentration of the reactant decreases from 0.02M to 0.005M in 10min.The time taken to change the concentration of reactant from 0.16M to 0.025M
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
easy
asked
Dec 16, 2013
by
sreemathi.v
1
answer
Page:
« prev
1
2
3
next »
Home
Ask
Tuition
Questions
Practice
Your payment for
is successful.
Continue
...
Please Wait
