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Standard XII
Chemistry
Concentration Terms - An Introduction (w/w etc)
In which of t...
Question
In which of the following cases, change of colour can be an indication of extent of the reaction?
A
S
O
2
(
g
)
+
1
2
O
2
(
g
)
⇋
S
O
3
(
g
)
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B
N
2
(
g
)
+
3
H
2
(
g
)
⇋
2
N
H
3
(
g
)
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C
2
H
I
(
g
)
⇋
H
2
(
g
)
+
I
2
(
g
)
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D
C
(
g
r
a
p
h
i
t
e
)
+
C
O
2
(
g
)
⇋
2
C
O
(
g
)
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Solution
The correct option is
C
2
H
I
(
g
)
⇋
H
2
(
g
)
+
I
2
(
g
)
During the reaction
2
H
I
(
g
)
⇋
H
2
(
g
)
+
I
2
(
g
)
, violet colored iodine fumes are liberated.
The intensity of the violet color is directly proportional to the concentration of iodine formed.
Thus, the extent of reaction can be estimated by the change of color.
Suggest Corrections
1
Similar questions
Q.
For which of the following reactions, the degree of dissociation cannot be calculated from the vapour density data
I.
2
H
I
(
g
)
⟶
H
2
(
g
)
+
I
2
(
g
)
II.
2
N
H
3
(
g
)
⟶
N
2
(
g
)
+
3
H
2
(
g
)
III.
2
N
O
(
g
)
⟶
N
2
(
g
)
+
O
2
(
g
)
IV.
P
C
l
5
(
g
)
⟶
P
C
l
3
(
g
)
+
C
l
2
(
g
)
Q.
Consider following reaction in equilibrium with equilibrium concentration 0.01 M of every species
(I)
P
C
l
5
(
g
)
⇌
P
C
l
3
(
g
)
+
C
l
2
(
g
)
(II)
2
H
I
(
g
)
⇌
H
2
(
g
)
+
I
2
(
g
)
(III)
N
2
(
g
)
+
3
H
2
(
g
)
⇌
2
N
H
3
(
g
)
Extend of the reaction taking place is:
Q.
Consider the following reactions in equilibrium with initial concentration of 0.01 M of every species (assuming the same equilibrium constant same).
(I)
P
C
l
5
(
g
)
⇌
P
C
l
3
(
g
)
+
C
l
2
(
g
)
(II)
2
H
I
(
g
)
⇌
H
2
(
g
)
+
I
2
(
g
)
(III)
N
2
(
g
)
+
3
H
2
(
g
)
⇌
2
N
H
3
(
g
)
Arrange these reactions in the order of the extent to which it takes place.
Q.
Consider following reactions in equilibrium with equilibrium concentration
0.01
M
of every species.
(I)
P
C
l
s
(
g
)
⇌
P
C
l
3
(
g
)
+
C
l
2
(
g
)
(ii)
2
H
I
(
g
)
⇋
H
2
(
g
)
+
l
2
(
g
)
(iii)
N
2
(
g
)
+
3
H
2
(
g
)
⇋
2
N
H
3
(
g
)
Extent of the reactions taking place is:
Q.
Given:
N
2
(
g
)
+
3
H
2
(
g
)
⇌
2
N
H
3
(
g
)
;
K
1
N
2
(
g
)
+
O
2
(
g
)
⇌
2
N
O
(
g
)
;
K
2
H
2
(
g
)
+
1
2
O
2
(
g
)
⇌
H
2
O
(
g
)
;
K
3
The equlibrium constant for the given reaction will be:
2
N
H
2
(
g
)
+
5
2
O
2
(
g
)
⇌
2
N
O
(
g
)
+
3
H
2
O
(
g
)
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