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Byju's Answer
Standard XII
Chemistry
Heat of Reaction
In the reacti...
Question
In the reaction,
(
N
H
4
)
2
C
r
2
O
7
Δ
−
→
N
2
+
H
2
O
+
C
r
2
O
3
The coefficient of
H
2
O
is :
A
1
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B
2
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C
3
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D
4
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Solution
The correct option is
D
4
(
N
H
4
)
2
C
r
2
O
7
(
s
)
→
N
2
(
g
)
+
4
H
2
O
(
g
)
+
C
r
2
O
3
(
s
)
To balance the reaction we require 4 moles of
H
2
O
.
Hence option D is correct.
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Similar questions
Q.
Consider following redox reactions:
I
:
(
N
H
4
)
2
C
r
2
O
7
⟶
N
2
+
C
r
2
O
3
+
H
2
O
I
I
:
N
H
4
N
O
3
⟶
N
2
O
+
2
H
2
O
I
I
I
:
2
K
C
l
O
3
⟶
2
K
C
l
+
3
O
2
Select intramolecular redox reactions.
Q.
Balance the following redox reactions in acidic solutions:
U
O
2
+
C
r
2
O
2
−
7
⟶
U
O
2
+
2
+
C
r
2
+
+
H
2
O
Q.
If the heats of formation of
A
l
2
O
3
(
s
)
and
C
r
2
O
3
(
s
)
are
1596
k
J
and
1134
k
J
(both exothermic) respectively. Calculate
Δ
H
of the thermite reaction.
C
r
2
O
3
(
s
)
+
2
A
l
(
s
)
⟶
2
C
r
(
s
)
+
A
l
2
O
3
(
s
)
Q.
Given a reaction:
C
r
2
O
2
−
7
+
F
e
2
+
+
H
⊕
⟶
C
r
3
+
+
F
e
3
+
+
H
2
O
The balanced equation is
6
F
e
2
+
+
14
H
⊕
+
C
r
2
O
2
−
7
⟶
6
F
e
3
+
+
2
C
r
3
+
+
7
H
2
O
.
If true enter 1, else enter 0.
Q.
C
r
2
O
2
−
7
+
X
H
⊕
−
−−−−−
→
C
r
3
+
+
H
2
O
+ oxidised product of
X
.
X
in the above reaction cannot be:
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