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Question
Chemistry
Corrosion of iron is essentially an electrochemical phenomenon where the cell reaction are
Q. Corrosion of iron is essentially an electrochemical phenomenon where the cell reaction are
4337
218
JIPMER
JIPMER 2013
Electrochemistry
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A
F
e
is oxidised to
F
e
2
+
and dissolved oxygen in water is reduced to
O
H
−
35%
B
Fe
is oxidised to
Fe
X
3
+
and
H
X
2
O
is reduced to
O
X
2
X
2
−
28%
C
Fe
is oxidised to
Fe
X
2
+
and
H
X
2
O
is reduced to
O
X
2
X
−
24%
D
Fe
is oxidised to
Fe
X
2
+
and
H
X
2
O
is reduced to
O
X
2
.
13%
Solution:
F
e
⟶
F
e
2
+
+
2
e
−
(anode reaction)
O
2
+
2
H
2
O
+
4
e
−
⟶
3
O
H
(cathode reaction)
The overall reaction is
2
F
e
+
O
2
+
2
H
2
O
⟶
2
F
e
(
O
H
)
2
F
e
(
O
H
)
2
may be dehydrated to iron oxide
F
e
O
, or further oxidised to
F
e
(
O
H
)
3
and then dehydrated to iron rust,
F
e
2
O
3