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Chemistry
When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to formation of
Q. When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to formation of
3945
200
KEAM
KEAM 2007
The d-and f-Block Elements
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A
C
r
O
3
2%
B
C
r
2
O
3
9%
C
C
r
O
5
71%
D
C
r
O
4
2
−
12%
E
C
r
2
O
7
2
−
12%
Solution:
Acidified potassium dichromate is oxidized to unstable blue chromium peroxide, which is soluble in ether and produces blue coloured solution.
K
2
C
r
2
O
7
+
H
2
S
O
4
+
4
H
2
O
2
→
b
l
u
e
co
l
o
u
r
2
C
r
O
5
+
K
2
S
O
4
+
5
H
2
O