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Question
Chemistry
The colour of K2Cr2O7 in acidic medium is
Q. The colour of
K
2
C
r
2
O
7
in acidic medium is
1766
247
Chhattisgarh PMT
Chhattisgarh PMT 2006
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A
red
B
green
C
yellow
D
pink
Solution:
In acid medium
K
2
C
r
2
O
7
gives green colour.
This is due to change of oxidation number of chromium from
+
6
to
+
3
.
K
2
C
r
2
O
7
+
4
H
2
S
O
4
→
C
r
2
(
S
O
4
)
3
+
K
2
S
O
4
+
4
H
2
O
+
3
[
O
]