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Standard XII
Chemistry
Potassium Dichromate
Question
Which of the following compounds is used as the starting material for the preparation of potassium dichromate?
K
2
S
O
4
.
C
r
2
(
S
O
4
)
3
.24
H
2
O
(Chromealum)
P
b
C
r
O
4
(Chromite yellow)
F
e
C
r
2
O
4
(Chromite)
P
b
C
r
O
4
.
P
b
O
(Chrome red)
A
K
2
S
O
4
.
C
r
2
(
S
O
4
)
3
.24
H
2
O
(Chromealum)
B
F
e
C
r
2
O
4
(Chromite)
C
P
b
C
r
O
4
(Chromite yellow)
D
P
b
C
r
O
4
.
P
b
O
(Chrome red)
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Solution
Verified by Toppr
Following step reactions are involved in preparation of
K
2
C
r
2
O
7
from Chromite ore (Fe
C
r
2
O
4
)
(i)4
F
e
C
r
2
O
4
+ 4
N
a
2
C
O
3
+9
O
2
→
8
N
a
C
r
O
4
+
2
F
e
2
O
3
+
4
C
O
2
(chromite ore).
(ii)
2
N
a
2
C
r
O
4
+
H
2
S
O
4
→
N
a
2
C
r
2
O
7
+
N
a
2
S
O
4
+
H
2
O
(iii)
2
N
a
2
C
r
2
O
7
+
2
K
C
l
→
2
K
2
C
r
2
O
7
+
2
N
a
C
l
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Similar Questions
Q1
Explain the manufacture of potassium dichromate from chromite ore
(
F
e
C
r
2
O
4
)
.
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Q2
Which of the following compounds is used as the starting material for the preparation of potassium dichromate?
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Q3
Write the equations involved in the preparation of potassium dichromate from chromite ore.
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Q4
How is potassium dichromate prepared from a sample of chromite ore? Give balanced equations for the chemical reactions involved.
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Q5
How is sodium chromate converted into sodium dichromate in the manufacture of potassium dichromate from chromite ore?
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