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Recent questions in Chemistry
Questions
>>
JEEMAIN and NEET
>>
Chemistry
Chemistry
Some Basic concepts in Chemistry
Atomic Structure
Classification of Elements and Periodicity in Properties
Chemical Bonding and Molecular Structure
Chemical Thermodynamics
Equilibrium
Redox Reactions
Hydrogen
s-Block Elements
p-Block Elements
P-Block elements (Group-13 and Group-14)
Hydrocarbons
Some Basic principles of Organic chemistry
Environmental Chemistry
States of Matter: Liquids and Gases
States of Matter: Solid State
Solutions
Electrochemistry
Surface Chemistry
General Principals and Processes of Isolation of Metals
p-Block elements (Group-15 to Group-18)
d-and-f-Block Elements
Co-ordination Compounds
Halogens
Oxygen: Alchohols, Phenols and Ethers
Nitrogen
Polymers
Biomolecules
Chemistry in everyday life
Practical Chemistry
Chemical Kinetics
Purification and Characterisation of Organic Compounds
Oxygen: Aldehydes, Ketones and Carboxylic Acids
The vapour pressure of pure liquid is 70 Torr at
27
∘
C
.The vapour pressure of a solution of this liquid and another liquid (mole fraction 0.2) is 84 Torr at
27
∘
C
.The vapour pressure of pure liquid B at
27
∘
C
is
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
ideal-and-non-ideal-solutions
medium
asked
Jul 22, 2014
by
sreemathi.v
1
answer
Which of the following solutions is expected to show negative deviations from Raoult's law?
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
ideal-and-non-ideal-solutions
medium
asked
Jul 22, 2014
by
sreemathi.v
1
answer
Which of the following solutions is expected to show positive deviations from Raoult's law?
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
ideal-and-non-ideal-solutions
medium
asked
Jul 22, 2014
by
sreemathi.v
1
answer
The vapour pressure of a solvent in a solution is proportional to
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
ideal-and-non-ideal-solutions
medium
asked
Jul 22, 2014
by
sreemathi.v
1
answer
The vapour-pressure lowering of a solvent is proportional to
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
ideal-and-non-ideal-solutions
medium
asked
Jul 22, 2014
by
sreemathi.v
1
answer
An azeotropic solution of two liquids has a boiling point higher than either of the boiling points of the two liquids when it
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
ideal-and-non-ideal-solutions
medium
asked
Jul 22, 2014
by
sreemathi.v
1
answer
Which of the following is true?
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
ideal-and-non-ideal-solutions
easy
asked
Jul 22, 2014
by
sreemathi.v
1
answer
The volume required to prepare 2.0L of 3.0M
H
2
S
O
4
solution from 96%
H
2
S
O
4
solution (density
1.83
g
m
L
−
1
) is
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
composition-of-a-solution
easy
asked
Jul 22, 2014
by
sreemathi.v
1
answer
An aqueous solution of HCl has 2% mass of HCl and a density of
1.02
g
c
m
−
3
.The numerical values of molarity and molality,respectively, are
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
composition-of-a-solution
easy
asked
Jul 22, 2014
by
sreemathi.v
1
answer
The volume of 96%
H
2
S
O
4
(density
1.83
g
m
L
−
1
) required to prepare 2.0L of 3.0M
H
2
S
O
4
solution is
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
composition-of-a-solution
easy
asked
Jul 22, 2014
by
sreemathi.v
1
answer
What mass of ethanol be added to 1.0Kg water to have the mole fraction of ethanol equal to 0.20?
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
composition-of-a-solution
easy
asked
Jul 22, 2014
by
sreemathi.v
1
answer
A molal solution is one that contains one mole of a solute in
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
composition-of-a-solution
easy
asked
Jul 22, 2014
by
sreemathi.v
1
answer
The density of a 10.0% by mass KCl solution in water is
1.06
g
c
m
−
3
,its molarity is
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
composition-of-a-solution
easy
asked
Jul 22, 2014
by
sreemathi.v
1
answer
For the electrochemical cell,
M
|
M
+
|
|
X
−
|
X
,
E
∘
(
M
+
|
M
)
=
0.44
V
and
E
∘
(
X
|
X
−
)
=
0.33
V
.From this data one can deduce that
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
medium
asked
Jul 22, 2014
by
sreemathi.v
1
answer
A gas X at 1 atm is bubbled through a solution containing a mixture of 1M Y and 1M Z at
25
∘
C
.If the reduction potential of
Z
>
Y
>
X
,then
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
medium
asked
Jul 22, 2014
by
sreemathi.v
1
answer
The standard reduction potential values of three metallic cations,X,Y,Z are 0.52,-3.03 and -1.18V,respectively.The order of reducing power of the corresponding metals is
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
medium
asked
Jul 22, 2014
by
sreemathi.v
1
answer
A standard hydrogen electrode has zero electrode potential because
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
easy
asked
Jul 22, 2014
by
sreemathi.v
1
answer
The standard reduction potentials of
C
u
2
+
|
C
u
and
C
u
2
+
|
C
u
+
are 0.337V and 0.153V, respectively.The standard electrode potential of
C
u
+
|
C
u
half cell is
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
difficult
asked
Jul 22, 2014
by
sreemathi.v
1
answer
A solution containing one mole per litre each of
C
u
(
N
O
3
)
2
,
A
g
N
O
3
,
H
g
2
(
N
O
3
)
2
is being electrolysed by using inert electrodes.The values of standard potentials are
E
∘
A
g
+
|
A
g
=
0.80
V
,
E
∘
H
g
2
+
2
|
H
g
=
0.79
V
,
E
∘
C
u
2
+
|
C
u
=
0.34
V
,
E
∘
M
g
2
+
|
M
g
=
−
2.3
V
with increasing voltage,the sequence of deposition of metals on the cathode will be
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
difficult
asked
Jul 22, 2014
by
sreemathi.v
1
answer
Adding powdered Pb and Fe to a solution containing 1.0M in each of
P
b
2
+
and
F
e
2
+
ions would result into the formation of
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
difficult
asked
Jul 22, 2014
by
sreemathi.v
1
answer
Consider the cell potentials
E
∘
M
g
2
+
|
M
g
=
−
2.37
V
and
E
∘
F
e
3
+
|
F
e
=
−
0.04
V
.The best reducing agent would be
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
difficult
asked
Jul 21, 2014
by
sreemathi.v
1
answer
Which of the following facts is not true?
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
difficult
asked
Jul 21, 2014
by
sreemathi.v
1
answer
The following facts are available.
2
X
−
+
Y
2
→
2
Y
−
+
X
2
2
W
−
+
Y
2
→
No reaction
2
Z
−
+
X
2
→
2
X
−
+
Z
2
Which of the following statements is correct?
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
easy
asked
Jul 21, 2014
by
sreemathi.v
1
answer
The current of 9.65A is drawn from a Daniell cell for exactly 1h.If molar masses of Cu and Zn are
63.5
g
m
o
l
−
1
and
6.54
g
m
o
l
−
1
,respectively,the loss in mass at anode and gain in mass at cathode,respectively,are
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
medium
asked
Jul 21, 2014
by
sreemathi.v
1
answer
A galvanic cell which makes use of the following reaction at 298K.
C
r
2
O
2
−
7
+
14
H
+
+
6
F
e
2
+
→
2
C
r
3
+
+
6
F
e
3
+
+
7
H
2
O
.Given :
E
∘
(
C
r
2
O
2
−
7
,
H
+
,
C
r
3
+
|
P
t
)
=
1.33
V
;
E
∘
(
F
e
3
+
,
F
e
2
+
|
P
t
)
=
0.77
V
.The strongest reductant is
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
easy
asked
Jul 21, 2014
by
sreemathi.v
1
answer
A galvanic cell which makes use of the following reaction at 298K.
C
r
2
O
2
−
7
+
14
H
+
+
6
F
e
2
+
→
2
C
r
3
+
+
6
F
e
3
+
+
7
H
2
O
.Given :
E
∘
(
C
r
2
O
2
−
7
,
H
+
,
C
r
3
+
|
P
t
)
=
1.33
V
;
E
∘
(
F
e
3
+
,
F
e
2
+
|
P
t
)
=
0.77
V
.The strongest oxidant is
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
easy
asked
Jul 21, 2014
by
sreemathi.v
1
answer
A galvanic cell which makes use of the following reaction at 298K.
C
r
2
O
2
−
7
+
14
H
+
+
6
F
e
2
+
→
2
C
r
3
+
+
6
F
e
3
+
+
7
H
2
O
.Given :
E
∘
(
C
r
2
O
2
−
7
,
H
+
,
C
r
3
+
|
P
t
)
=
1.33
V
;
E
∘
(
F
e
3
+
,
F
e
2
+
|
P
t
)
=
0.77
V
.Reducing
[
C
r
3
+
]
to 0.50M,keeping all other concentrations at unity,the emf of the cell would be changed by
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
medium
asked
Jul 21, 2014
by
sreemathi.v
1
answer
A galvanic cell which makes use of the following reaction at 298K.
C
r
2
O
2
−
7
+
14
H
+
+
6
F
e
2
+
→
2
C
r
3
+
+
6
F
e
3
+
+
7
H
2
O
.Given :
E
∘
(
C
r
2
O
2
−
7
,
H
+
,
C
r
3
+
|
P
t
)
=
1.33
V
;
E
∘
(
F
e
3
+
,
F
e
2
+
|
P
t
)
=
0.77
V
.If
[
C
r
2
O
2
−
7
]
=
1.0
M
,
[
C
r
3
+
]
=
0.5
M
,
[
F
e
2
+
]
=
0.5
M
,
[
F
e
3
+
]
=
2.0
M
and
[
H
3
O
+
]
=
2.0
M
,then the cell emf at 298K would be
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
medium
asked
Jul 21, 2014
by
sreemathi.v
1
answer
A galvanic cell which makes use of the following reaction at 298K.
C
r
2
O
2
−
7
+
14
H
+
+
6
F
e
2
+
→
2
C
r
3
+
+
6
F
e
3
+
+
7
H
2
O
.Given :
E
∘
(
C
r
2
O
2
−
7
,
H
+
,
C
r
3
+
|
P
t
)
=
1.33
V
;
E
∘
(
F
e
3
+
,
F
e
2
+
|
P
t
)
=
0.77
V
.Increasing
[
H
3
O
+
]
to 2.0M, keeping all other concentrations at unity,will change the cell emf by
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
medium
asked
Jul 21, 2014
by
sreemathi.v
1
answer
A galvanic cell which makes use of the following reaction at 298K.
C
r
2
O
2
−
7
+
14
H
+
+
6
F
e
2
+
→
2
C
r
3
+
+
6
F
e
3
+
+
7
H
2
O
.Given :
E
∘
(
C
r
2
O
2
−
7
,
H
+
,
C
r
3
+
|
P
t
)
=
1.33
V
;
E
∘
(
F
e
3
+
,
F
e
2
+
|
P
t
)
=
0.77
V
.Increasing
[
F
e
3
+
]
to 2.0M keeping all other concentrations at unity,the emf of the cell is changed by
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
medium
asked
Jul 21, 2014
by
sreemathi.v
1
answer
A galvanic cell which makes use of the following reaction at 298K.
C
r
2
O
2
−
7
+
14
H
+
+
6
F
e
2
+
→
2
C
r
3
+
+
6
F
e
3
+
+
7
H
2
O
.Given :
E
∘
(
C
r
2
O
2
−
7
,
H
+
,
C
r
3
+
|
P
t
)
=
1.33
V
;
E
∘
(
F
e
3
+
,
F
e
2
+
|
P
t
)
=
0.77
V
.Reducing
[
F
e
3
+
]
to 0.50M keeping all other concentrations at unity,the emf of the cell will be changed by
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
medium
asked
Jul 21, 2014
by
sreemathi.v
1
answer
A galvanic cell which makes use of the following reaction at 298K.
C
r
2
O
2
−
7
+
14
H
+
+
6
F
e
2
+
→
2
C
r
3
+
+
6
F
e
3
+
+
7
H
2
O
.Given :
E
∘
(
C
r
2
O
2
−
7
,
H
+
,
C
r
3
+
|
P
t
)
=
1.33
V
;
E
∘
(
F
e
3
+
,
F
e
2
+
|
P
t
)
=
0.77
V
.Upon discharge of the cell for 80 min at one ampere,the anode was found to have decreased in mass by
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
easy
asked
Jul 21, 2014
by
sreemathi.v
1
answer
A galvanic cell which makes use of the following reaction at 298K.
C
r
2
O
2
−
7
+
14
H
+
+
6
F
e
2
+
→
2
C
r
3
+
+
6
F
e
3
+
+
7
H
2
O
.Given :
E
∘
(
C
r
2
O
2
−
7
,
H
+
,
C
r
3
+
|
P
t
)
=
1.33
V
;
E
∘
(
F
e
3
+
,
F
e
2
+
|
P
t
)
=
0.77
V
.The cell emf is independent of
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
easy
asked
Jul 21, 2014
by
sreemathi.v
1
answer
A galvanic cell which makes use of the following reaction at 298K.
C
r
2
O
2
−
7
+
14
H
+
+
6
F
e
2
+
→
2
C
r
3
+
+
6
F
e
3
+
+
7
H
2
O
.Given :
E
∘
(
C
r
2
O
2
−
7
,
H
+
,
C
r
3
+
|
P
t
)
=
1.33
V
;
E
∘
(
F
e
3
+
,
F
e
2
+
|
P
t
)
=
0.77
V
.The cell emf depends on
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
easy
asked
Jul 21, 2014
by
sreemathi.v
1
answer
A galvanic cell which makes use of the following reaction at 298K.
C
r
2
O
2
−
7
+
14
H
+
+
6
F
e
2
+
→
2
C
r
3
+
+
6
F
e
3
+
+
7
H
2
O
.Given :
E
∘
(
C
r
2
O
2
−
7
,
H
+
,
C
r
3
+
|
P
t
)
=
1.33
V
;
E
∘
(
F
e
3
+
,
F
e
2
+
|
P
t
)
=
0.77
V
.Within the cell,it is important to prevent mixing or direct contact of
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
easy
asked
Jul 21, 2014
by
sreemathi.v
1
answer
A galvanic cell which makes use of the following reaction at 298K.
C
r
2
O
2
−
7
+
14
H
+
+
6
F
e
2
+
→
2
C
r
3
+
+
6
F
e
3
+
+
7
H
2
O
.Given :
E
∘
(
C
r
2
O
2
−
7
,
H
+
,
C
r
3
+
|
P
t
)
=
1.33
V
;
E
∘
(
F
e
3
+
,
F
e
2
+
|
P
t
)
=
0.77
V
.The cathode of the cell might be
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
easy
asked
Jul 21, 2014
by
sreemathi.v
1
answer
A galvanic cell which makes use of the following reaction at 298K.
C
r
2
O
2
−
7
+
14
H
+
+
6
F
e
2
+
→
2
C
r
3
+
+
6
F
e
3
+
+
7
H
2
O
.Given :
E
∘
(
C
r
2
O
2
−
7
,
H
+
,
C
r
3
+
|
P
t
)
=
1.33
V
;
E
∘
(
F
e
3
+
,
F
e
2
+
|
P
t
)
=
0.77
V
.The anode of the cell might be
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
easy
asked
Jul 21, 2014
by
sreemathi.v
1
answer
A galvanic cell which makes use of the following reaction at 298K.
C
r
2
O
2
−
7
+
14
H
+
+
6
F
e
2
+
→
2
C
r
3
+
+
6
F
e
3
+
+
7
H
2
O
.Given :
E
∘
(
C
r
2
O
2
−
7
,
H
+
,
C
r
3
+
|
P
t
)
=
1.33
V
;
E
∘
(
F
e
3
+
,
F
e
2
+
|
P
t
)
=
0.77
V
.The cell emf could be increased above the standard emf by
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
easy
asked
Jul 21, 2014
by
sreemathi.v
1
answer
A galvanic cell which makes use of the following reaction at 298K.
C
r
2
O
2
−
7
+
14
H
+
+
6
F
e
2
+
→
2
C
r
3
+
+
6
F
e
3
+
+
7
H
2
O
.Given :
E
∘
(
C
r
2
O
2
−
7
,
H
+
,
C
r
3
+
|
P
t
)
=
1.33
V
;
E
∘
(
F
e
3
+
,
F
e
2
+
|
P
t
)
=
0.77
V
.The standard emf of the cell is
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
easy
asked
Jul 21, 2014
by
sreemathi.v
1
answer
A galvanic cell which makes use of the following reaction at 298K.
C
r
2
O
2
−
7
+
14
H
+
+
6
F
e
2
+
→
2
C
r
3
+
+
6
F
e
3
+
+
7
H
2
O
.Given :
E
∘
(
C
r
2
O
2
−
7
,
H
+
,
C
r
3
+
|
P
t
)
=
1.33
V
;
E
∘
(
F
e
3
+
,
F
e
2
+
|
P
t
)
=
0.77
V
.The contribution made to the standard emf of the cell by reduction half-cell is
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
easy
asked
Jul 21, 2014
by
sreemathi.v
1
answer
A galvanic cell which makes use of the following reaction at 298K.
C
r
2
O
2
−
7
+
14
H
+
+
6
F
e
2
+
→
2
C
r
3
+
+
6
F
e
3
+
+
7
H
2
O
.Given :
E
∘
(
C
r
2
O
2
−
7
,
H
+
,
C
r
3
+
|
P
t
)
=
1.33
V
;
E
∘
(
F
e
3
+
,
F
e
2
+
|
P
t
)
=
0.77
V
.The contribution made to the standard emf of the cell by oxidation half-cell is
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
easy
asked
Jul 21, 2014
by
sreemathi.v
1
answer
Given that
E
∘
F
e
3
+
|
F
e
and
E
∘
F
e
2
+
|
F
e
are -0.36V and -0.439V,respectively.The value of
E
∘
F
e
3
+
,
F
e
2
+
|
P
t
would be
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
medium
asked
Jul 21, 2014
by
sreemathi.v
1
answer
The value of
E
H
2
O
|
H
2
(
1
b
a
r
)
|
P
t
at 298K would be
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
medium
asked
Jul 21, 2014
by
sreemathi.v
1
answer
Given that
E
H
2
O
|
H
2
(
1
b
a
r
)
|
P
t
=
0
at 298K.The pressure of
H
2
gas would be
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
medium
asked
Jul 21, 2014
by
sreemathi.v
1
answer
Given that
E
∘
values of
A
g
+
|
A
g
,
K
+
|
K
,
M
g
2
+
|
M
g
and
C
r
3
+
|
C
r
are 0.80V,-2.93V,-2.37V,and -0.74V,respectively.Which of the following orders regarding the reducing power of metals is correct?
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
medium
asked
Jul 21, 2014
by
sreemathi.v
1
answer
By how much will the potential of half-cell
C
u
2
+
|
C
u
change if the solution is diluted to 100 times at 298K?
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
medium
asked
Jul 21, 2014
by
sreemathi.v
1
answer
The reduction potential of hydrogen half-cell will be negative if
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
medium
asked
Jul 21, 2014
by
sreemathi.v
1
answer
Given :
E
∘
(
C
u
2
+
|
C
u
)
=
0.337
V
and
E
∘
(
S
n
2
+
|
S
n
)
=
−
0.136
V
.Which of the following statements is correct?
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
easy
asked
Jul 21, 2014
by
sreemathi.v
1
answer
Two half cells have potentials -0.76V and -0.13V respectively.A galvanic cell is made from these two-half cells.Which of the following statements is correct?
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
easy
asked
Jul 21, 2014
by
sreemathi.v
1
answer
Which of the following facts regarding the movement of anions in the solution is correct
jeemain
chemistry
physical-chemistry
class12
ch3
electrochemistry
galvanic-cells
easy
asked
Jul 21, 2014
by
sreemathi.v
1
answer
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