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Class 12
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Chemistry
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Electrochemistry
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Electrolytic Cells and Electrolysis
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Numerical on Faraday's Second Law of Ele...
Numerical on Faraday's Second Law of Electrolysis
13 Mins
Chemistry
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REVISE WITH CONCEPTS
Faraday's Law
Example
Definitions
Formulaes
>
QUICK SUMMARY WITH STORIES
Introduction to Electrolysis
3 mins
Faraday Second Law of Electrolysis
3 mins
Important Questions
Calculate the emf of the cell in which of the following reaction takes place:
N
i
(
s
)
+
2
A
g
+
(
0
.
0
0
2
M
)
→
N
i
2
+
(
0
.
1
6
0
M
)
+
2
A
g
(
s
)
[Given that
E
c
e
l
l
∘
=
1
.
0
5
V
]
Medium
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>
During the electrolysis of molten sodium chloride, the time required to produce 0.10 mol of chlorine gas using a current of 3 amperes is:
Hard
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>
How much electricity in terms of Faraday is required to produce:
(i)
2
0
g
of
C
a
from molten
C
a
C
l
2
(ii)
4
0
g
of
A
l
from molten
A
l
2
O
3
[Given : Molar mass of calcium & Aluminium are 40 g
m
o
l
−
1
& 27 g
m
o
l
−
1
respectively]
Medium
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>
How would you determine the standard electrode potential of the
M
g
2
+
∣
M
g
?
Hard
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>
A solution of
N
i
(
N
O
3
)
2
is electrolysed between platinum electrodes using a current of
5
amperes for
2
0
minutes. What mass of
N
i
is deposited at the cathode?
Medium
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>
Three electrolytic cells
A
,
B
,
C
containing solutions of
Z
n
S
O
4
,
A
g
N
O
3
and
C
u
S
O
3
, respectively are connected in series. A steady current of
1
.
5
amperes was passed through them until
1
.
4
5
g
of silver deposited at the cathode of cell
B
. How long did the current flow? What mass of copper and zinc were deposited?
Hard
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>
How much charge is required for the following reductions?
(i)
1
m
o
l
of
A
l
3
+
to
A
l
(ii)
1
m
o
l
of
C
u
2
+
to
C
u
(iii)
1
m
o
l
of
M
n
O
4
−
to
M
n
2
+
Medium
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>
The weight of silver (atomic weight
=
1
0
8
) displaced by a quantity of electricity which displaces 5600 ml of
O
2
at STP will be:
Medium
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>
How much electricity is required in coulomb for the oxidation of:
(i)
1
m
o
l
of
H
2
O
to
O
2
?
(ii)
1
m
o
l
of
F
e
O
to
F
e
2
O
3
?
Medium
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>
If a current of 0.5 ampere flows through a metallic wire for 2 hours, then how many electrons would flow through the wire?
Medium
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>