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Manipal Entrance Test 2020 Chemistry Paper
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© examsnet.com
Question : 39
Total: 50
Acidic dichromate ion reacts with hydrogen peroxide to give deep blue colour. This is due to the formation of
C
r
O
(
O
)
2
C
r
O
5
Both (a) and (b)
None of (a) and (b)
Validate
Solution:
When cold
H
2
O
2
is added in cold mixture of
K
2
C
r
2
O
7
and conc.
H
2
S
O
4
(i.e.
K
2
C
r
2
O
7
in acidic medium), a deep blue solution of blue perchromate is obtained as,
K
2
C
r
2
O
7
+
H
2
S
O
4
⟶
K
2
S
O
4
+
H
2
C
r
2
O
7
H
2
C
r
2
O
7
+
4
H
2
O
2
⟶
2
C
r
O
5
+
5
H
2
O
Blue
perchromate
© examsnet.com
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