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Byju's Answer
Standard XII
Chemistry
Common Oxidation States
HCHO+ K 2 Cr ...
Question
H
C
H
O
+
K
2
C
r
2
O
7
+
H
2
S
O
4
⟶
?
What is the product of the reaction?
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Solution
H
C
H
O
in presence of
K
2
C
r
2
O
7
undergoes oxidation reaction to give formic acid as a product.
Here, the
K
2
C
r
2
O
7
act as oxidizing agent and causes oxidation of
H
C
H
O
.
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Similar questions
Q.
In the chemical reaction,
K
2
C
r
2
O
7
+
a
H
2
S
O
4
+
b
S
O
2
→
K
2
S
O
4
+
C
r
2
(
S
O
4
)
3
+
c
H
2
O
. a, b and c are:
Q.
Balance the following equation by oxidation number method
i)
K
2
C
r
2
O
7
+
K
I
+
H
2
S
O
4
→
K
2
S
O
4
+
C
r
2
(
S
O
4
)
3
+
I
2
+
H
2
O
ii)
K
M
n
O
4
+
N
a
2
S
O
3
→
M
n
O
2
+
N
a
2
S
O
4
+
K
O
H
iii)
C
u
+
H
N
O
3
→
C
u
(
N
O
3
)
2
+
N
O
2
+
H
2
O
iv)
K
M
n
O
4
+
H
2
C
2
O
4
+
H
2
S
O
4
→
K
2
S
O
4
+
M
n
S
O
4
+
C
O
2
+
H
2
O
Q.
[
X
]
+
H
2
S
O
4
⟶
[
Y
]
a colourless gas with irritating smell
[
Y
]
+
K
2
C
r
2
O
7
+
H
2
S
O
4
⟶
green solution
[X] and [Y] are:
Q.
K
2
C
r
2
O
7
+
c
o
n
c
.
H
2
S
O
4
+
H
2
O
2
+
e
t
h
e
r
⟶
blue perchromic anhydride (in ethereal layer). Blue colour is due to
:
Q.
Which of the following statements is/are correct, when a mixture of
N
a
C
l
and
K
2
C
r
2
O
7
is gently warmed with concentrated
H
2
S
O
4
?
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