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Class 11
>>
Chemistry
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Equilibrium
>>
Hard Questions
Equilibrium
Chemistry
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The dissociation of water at
2
5
∘
C is
1
.
9
×
1
0
−
7
%
and the density of water is
1
.
0
g/cc. The ionisation constant of water is :
A
3
.
4
2
×
1
0
−
6
B
3
.
4
2
×
1
0
−
8
C
1
.
0
0
×
1
0
−
1
4
D
2
.
0
0
×
1
0
−
1
6
Hard
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>
The degree of dissociation of 0.1 M weak acid HA is 0.5%. If 2 ml of 1.0 M HA solution is diluted to 32 ml, the degree of dissociation of acid and
H
3
O
+
ion concentration in the resulting solution will be respectively:
A
0
.
0
2
and
3
.
1
2
5
×
1
0
−
4
B
1
.
2
5
×
1
0
−
3
and
0
.
0
2
C
0
.
6
3
2
and
3
.
9
5
×
1
0
−
4
D
0
.
0
2
and
8
.
0
×
1
0
−
1
2
Hard
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>
Which of the following statements is correct?
A
The
p
H
of
1
.
0
×
1
0
−
8
M
solution of
H
C
l
is
8
B
The conjugate base of
H
2
P
O
4
−
2
is
H
P
O
4
−
2
C
Autoprotolysis constant of water increases with temperature
D
When a solution of weak monoprotic acid is titrated against a strong base, at half neutralization point
p
H
=
2
1
p
K
a
Hard
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>
Total number of moles for the reaction
2
H
I
⇌
H
2
+
I
2
, if
α
is degree of dissociation is :
A
2
B
2
−
α
C
1
D
1
−
α
Hard
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>
The first and second dissociation constants of an acid
H
2
A
are
1
.
0
×
1
0
−
5
and
5
.
0
×
1
0
−
1
0
respectively. The overall dissociation constant of the acid will be:
A
5
.
0
×
1
0
−
5
B
5
.
0
×
1
0
1
5
C
5
.
0
×
1
0
−
1
5
D
2
.
0
×
1
0
5
Hard
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>
If the dissociation constant of a weak acid is
1
.
0
×
1
0
−
5
, then the equilibrium constant for the reaction of the acid with a strong base is:
A
1
.
0
×
1
0
−
5
B
1
.
0
×
1
0
−
9
C
1
.
0
×
1
0
9
D
1
.
0
×
1
0
1
4
Hard
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>
Assertion
H
2
O
is stronger acid than
D
2
O
.
Reason
At
2
5
∘
C
ionic product of water is
1
.
0
×
1
0
−
1
4
and that of
D
2
O
is
1
.
3
5
×
1
0
−
1
5
.
Read the above assertion and reason and choose the correct option regarding it.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C
Assertion is correct but Reason is incorrect
D
Assertion is incorrect but Reason is correct
Hard
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>
A precipitate of calcium oxalate will not dissolve in:
A
H
C
l
B
H
N
O
3
C
a
q
u
a
r
e
g
i
a
D
C
H
3
C
O
O
H
Hard
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>
Blood
p
H
is controlled by the concentrations of
H
2
C
O
3
and
H
C
O
3
−
. In the presence of
N
a
H
C
O
3
,
p
H
of blood:
A
increases
B
decreases
C
does not change
D
first decreases and then increases
Hard
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>
Which of the following mixture is not a buffer solution?
A
100 ml of 0.5
N
H
4
C
l
and 100 ml of 0.6
N
N
H
4
O
H
B
100 ml of 0.6
N
H
C
N
and 100 ml of 0.4
N
N
a
O
H
C
100 ml of 0.2
N
N
H
4
O
H
and 100 ml of 0.2
N
C
H
3
C
O
O
H
D
100 ml of 0.4
N
H
C
l
and 100 ml of 0.4
N
N
a
O
H
Hard
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>