338 Chemical Equilibrium
1. One mole of
3
SO
was placed in a litre reaction vessel at a
certain temperature. The following equilibrium was established
3
2SO
⇌
22
2OSO
At equilibrium 0.6 moles of
2
SO
were formed. The
equilibrium constant of the reaction will be [MP PMT 1991]
(a) 0.36 (b) 0.45
(c) 0.54 (d) 0.675
2. For the following homogeneous gas reaction
23 54 ONH
⇌
OHNO 2
64
, the equilibrium constant
c
K
has the
dimension of [CPMT 1990; MP PET/PMT 1998 ]
(a)
10
Conc
(b)
1
Conc
(c)
1
Conc
(d) It is dimensionless
3. Consider the imaginary equilibrium
4A + 5B ⇌ 4X + 6Y
The equilibrium constant
c
K
has the unit [RPMT 2000]
(a) Mole2 litre-2 (b) Litre mole-1
(c) Mole litre-1 (d) Litre2 mole-2
4. For the reaction
)(2)( 2gHgCO
⇌
)(
3gOHCH
, true
condition is
(a)
cp KK
(b)
cp KK
(c)
cp KK
(d)
0
c
K
but
0
p
K
5. For the reaction
)(
2
1
)( 2gOgCO
⇌
)(
2gCO
;
c
p
K
K
is
equivalent to [M P PET/PMT 1998; AIEEE 2002]
(a) 1 (b)
RT
(c)
RT
1
(d)
2/1
)(RT
6.
)( 2
)( 2
)( 52 42 ggg
ONOON
what is the ratio of the rate of
decomposition of
52ON
to rate of formation of
2
NO
[DCE 2003]
(a)
2:1
(b)
1:2
(c)
4:1
(d)
1:4
7. The reaction quotient (Q) for the reaction
)(2 g
N
)(2
3g
H
⇌
)(3
2g
NH
is given by
3
22
2
3]][[
][
HN
NH
Q
. The reaction will proceed from
right to left is [CBSE PMT 2003]
(a) Q = 0 (b) Q =
c
K
(c) Q <
c
K
(d) Q >
c
K
Where
c
K
is the equilibrium constant
8. In the thermal dissociation of
5
PCl
, the partial pressure in the
gaseous equilibrium mixture is 1.0 atmosphere when half of
5
PCl
is found to dissociate. The equilibrium constant of the
reaction
)( p
K
in atmosphere is [JIPMER 2002]
(a) 0.25 (b) 0.50
(c) 1.00 (d) 0.3
9.
HI
was heated in a closed tube at
C
o
440
till equilibrium is
obtained. At this temperature 22% of
HI
was dissociated. The
equilibrium constant for this dissociation will be
[MP PET 1988, 92; MNR 1987 ; UPSEAT 2000]
(a) 0.282 (b) 0.0796
(c) 0.0199 (d) 1.99
10. The following equilibrium exists in aqueous solution
COOHCH3
⇌
HCOOCH 3
. If dilute
HCl
is added
without a change in temperature, then the [MNR 1987]
(a) Concentration of
COOCH 3
will increase
(b) Concentration of
COOCH 3
will decrease
(c) Equilibrium constant will increase
(d) Equilibrium constant will decrease
11. Which of the following is not favourable for
3
SO
formation
)()(2 22 gOgSO
⇌
kcalHgSO 0.45);(2 3
[IIT 1984; MP PET 1997]
(a) High pressure
(b) High temperature
(c) Decreasing
3
SO
concentration
(d) Increasing reactant concentration
12.
gm120
of urea are present in
litre5
solution, the active mass
of urea is [MP PMT 1994]
(a) 0.2 (b) 0.06
(c) 0.4 (d) 0.08
13. For the system
)()(2 gBgA
⇌
)(3 gC
, the expression for
equilibrium constant K is [NCERT 1973; DCE 1999]
(a)
]3[
][]2[
C
BA
(b)
3
2
][
][][
C
BA
(c)
][]2[
]3[
BA
C
(d)
][][
][
2
3
BA
C
14. If concentration of reactants is increased by
''x
, then
K
becomes [AFMC 1997]
(a) ln (
xK/
) (b)
xK/
(c)
xK
(d)
K
(SET -8)
