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Standard X
Chemistry
Extraction of Iron
When FeCr2O...
Question
When
F
e
C
r
2
O
4
(chromite) is reduced with
A
l
:
A
C
r
and
F
e
2
O
3
, are formed
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B
F
e
and
C
r
2
O
3
are formed
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C
F
e
and
C
r
(ferrochrome) are formed
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D
F
e
C
r
O
4
. is formed
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Solution
The correct option is
C
F
e
and
C
r
(ferrochrome) are formed
For the production of ferrochrome (
F
e
and
C
r
), the chromite ore (
F
e
C
r
2
O
4
) is reduced with either aluminium or silicon in an aluminothermic reaction.
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Similar questions
Q.
F
e
C
r
2
O
4
(Chromite) is a good source of chromium and its compound like
N
a
2
C
r
O
4
and
N
a
2
C
r
2
O
7
I.
F
e
C
r
2
O
4
+
N
a
O
H
+
a
i
r
⟶
(
A
)
+
F
e
2
O
3
II.
(
A
)
+
(
B
)
⟶
N
a
2
C
r
2
O
7
III.
N
a
2
C
r
2
O
7
+
X
△
⟶
C
r
2
O
3
IV.
C
r
2
O
3
+
Y
△
⟶
C
r
Compounds (A) and (B) are:
Q.
In
F
e
C
r
2
O
4
, the oxidation number of fe and Cr are:
Q.
In
F
e
C
r
2
O
4
the oxidation numbers of Fe and Cr are:
Q.
F
e
C
r
2
O
4
(chromite) is converted to
C
r
by following steps :
Chromite
I
→
N
a
C
r
O
4
I
I
−
→
C
r
2
O
3
I
I
I
−
−
→
C
r
Reagents in I, II and III might be :
I- Step II-Step III-Step
Q.
F
e
C
r
2
O
4
(chromite) is converted to Cr by following steps :
C
h
r
o
m
i
t
e
I
→
N
a
2
C
r
O
4
I
I
→
C
r
2
O
3
I
I
I
→
C
r
I, II and III are
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