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NEET-UG SERIES
Chemistry

Equilibrium

65 previous year questions.

Volume: 65 Ques
Yield: High

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Chapter Questions
65 MCQs

01
PYQ 1989
easy
chemistry ID: neet-ug-
and are equilibrium constant for reactions (i) and (ii)
(i)
(ii) .Then,
1
2
3
4
02
PYQ 1991
medium
chemistry ID: neet-ug-
Aqueous solution of acetic acid contains
1
and
2
and
3
and
4
and
03
PYQ 1992
medium
chemistry ID: neet-ug-
0.1M solution of which one of these substances will be basic?
1
Sodium borate
2
Calcium nitrate
3
4
Sodium sulphate
04
PYQ 1994
medium
chemistry ID: neet-ug-
At certain temperature, 50% of HI is dissociated into and , the equilibrium constant is
1
1
2
3
3
0.5
4
0.25
05
PYQ 1994
medium
chemistry ID: neet-ug-
At , distilled water has concentration equal to mole/litre. The value of at this temperature will be
1
2
3
4
06
PYQ 1994
medium
chemistry ID: neet-ug-
1.1 mol of A is mixed with 2.2 mol of B and the mixture is kept in one litre flask till the equilibrium is reached. At equilibrium, 0.2 mol of C is formed. If the equilibrium reaction is the value of equilibrium constant is
1
0.0002
2
0.0004
3
0.001
4
0.003
07
PYQ 1999
medium
chemistry ID: neet-ug-
The solubility of a saturated solution of calcium fluoride is moles per litre. Its solubility product is
1
2
3
4
08
PYQ 2000
medium
chemistry ID: neet-ug-
Equilibrium constant for following reaction :
1
2
3
4
09
PYQ 2000
medium
chemistry ID: neet-ug-
For a any reversible reaction. If increases concentration of reactants. Then effect on equilibrium constant:
1
Depends on amount of concentration
2
Unchange
3
Decrease
4
Increase
10
PYQ 2000
medium
chemistry ID: neet-ug-

Which statement is wrong about and ?

1
pH of neutral water does not zero
2

Adding 1N,1N soln of CH3COOH and NaOH pH will be seven

3

pH of dilute and hot H2SO4 is more than concentrate and cold H2SO4

4

Mixing solution of CH3COOH and HCl, pH will be less than 7

11
PYQ 2000
medium
chemistry ID: neet-ug-
Correct relation b/w dissociation constant's of a di-basic acid:
1

2

3

4

12
PYQ 2000
medium
chemistry ID: neet-ug-

1

2

3

4

13
PYQ 2001
medium
chemistry ID: neet-ug-

Solubility of a salt is , then find out solubility product.

1

2

3

4

14
PYQ 2001
medium
chemistry ID: neet-ug-
Ionisation constant of is and concentration of ions is . Then, find out initial concentration of molecules.
1
2
3
4
15
PYQ 2002
easy
chemistry ID: neet-ug-

Reaction BaO2 (s) BaO (s) + O2(g); ∆H = + ve. In equilibrium condition. The pressure of O2 depends on :

1

Increase mass of BaO2

2
Increase mass of BaO
3
Increase temp. on Eqm.
4

Increase mass of BaO2 and BaO both

16
PYQ 2002
medium
chemistry ID: neet-ug-
Which has highest pH:-
1
2
3
4
17
PYQ 2002
medium
chemistry ID: neet-ug-

The solubility of MX2–type electrolytes is 0.5 × 10–4 Mole/lit. then find out the Ksp of electrolytes :

1

5 × 10–12

2

25 × 10–10

3

1 × 10–13

4

5 × 10–13

18
PYQ 2003
medium
chemistry ID: neet-ug-
The solubility product of AgI at 25ºC is 1.0×10–16 mol2L–2. The solubility of AgI in 10–4N solution of KI at 25ºC is approximately (in mol L–1):
1
1.0×10–16
2
1.0×10–12
3
1.0×10–10
4
1.0×10–8
19
PYQ 2003
medium
chemistry ID: neet-ug-
The reaction quotient (Q) for the reaction is given by . The reaction will proceed from right to left if: (where KC is the equilibrium constant)
1
Q=KC
2
Q
3
Q>KC
4
Q=0
20
PYQ 2003
medium
chemistry ID: neet-ug-
In Haber process of dihydrogen and of dinitrogen were taken for reaction which yielded only of the expected product. What will be the composition of gaseous mixture under the aforesaid condition in the end?
1
20 L ammonia, 10 L nitrogen, 30 L hydrogen
2
20 L ammonia, 25 L nitrogen, 15 L hydrogen
3
20 L ammonia, 20 L nitrogen, 20 L hydrogen
4
10 L ammonia, 25 L nitrogen, 15 L hydrogen
21
PYQ 2004
medium
chemistry ID: neet-ug-
The rapid change of near the stoichiometric point of an acid base titration is the basis of indicator detection. of the solution is related to ratio of the concentrations of the conjugate acid ( ) and base forms of the indicator given by the expression
1
2
3
4
22
PYQ 2005
medium
chemistry ID: neet-ug-
H2S gas when passed through a solution of cations containing HCl precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because:
1

presence of HCl decreases the sulphide ion concentration

2

presence of HCl increases the sulphide ion concentration

3

solubility product of group II sulphides is more than that of group IV sulphides

4

sulphides of group IV cations are unstable in HCl

23
PYQ 2005
medium
chemistry ID: neet-ug-
The correct order of acid strength is
1

HClO < HClO2 < HClO3 < HClO4

2

HClO4 < HClO< HClO2 < HClO3

3

HClO2 < HClO3 < HClO4 < HClO

4

HClO4 < HClO3 < HClO2 < HClO

24
PYQ 2005
medium
chemistry ID: neet-ug-
What is the correct relationship between the pHs of isomolar solutions of sodium oxide (pH1),sodium sulphide (pH2),sodium selenide (pH3) and sodium telluride (pH4)?
1

pH1 > pH2 pH3 > pH4

2

pH1 < pH2 < pH3 < pH4

3

pH1 < pH2 < pH3 pH4

4

pH1 .> pH2 > pH3 > pH4

25
PYQ 2005
medium
chemistry ID: neet-ug-
At , the dissociation constant of a base, BOH is . The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be
1
2
3
4
26
PYQ 2005
medium
chemistry ID: neet-ug-
gas when passed through a solution of cations containing precipitates the cations of second group in qualitative analysis but not those belonging to the fourth group. It is because
1
presence of HCI decreases the sulphide ion concentration
2
presence of HCI increases the sulphide ion concentration
3
solubility product of group II sulphides is more than that of group IV sulphides
4
sulphides of group IV cations are unstable in HCI
27
PYQ 2005
easy
chemistry ID: neet-ug-
Equilibrium constants K1 and K2 for the following equilibria: NO(g)+ O2 NO2(g) and 2NO2(g) 2NO(g)+O2(g) are related as:
28
PYQ 2006
easy
chemistry ID: neet-ug-
Which of the following pairs constitutes a buffer?
1
&
2
&
3
&
4
&
29
PYQ 2006
medium
chemistry ID: neet-ug-
The hydrogen ion concentration of a aqueous solution at 298 K is :-
1
2
3
4
30
PYQ 2006
medium
chemistry ID: neet-ug-
For the reaction Which of the following statements is not true:
1
At equilibrium, the concentrations of and are not equal
2
The equilibrium constant for the reaction is given by
3
Addition of (g)or (q)at equilibrium will cause a shift to the right
4
The reaction is exothermic
31
PYQ 2008
medium
chemistry ID: neet-ug-
In the reaction; , if the concentration of ions is decreased by times, then the equilibrium concentration of will increase by,
1
8 times
2
16 times
3
64 times
4
4 times
32
PYQ 2008
medium
chemistry ID: neet-ug-
Equal volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the ion concentration in the mixture?
1
2
3
4
33
PYQ 2008
medium
chemistry ID: neet-ug-
The value of equilibrium constant of the reaction, . The equilibrium constant of the reaction, Will be
1
2
3
16
4
34
PYQ 2009
medium
chemistry ID: neet-ug-
What is the in the final solution prepared by mixing of with of ?
1
0.10M
2
0.40M
3
0.0050M
4
0.12M
35
PYQ 2009
medium
chemistry ID: neet-ug-
The equivalent conductance of solution of a weak monobasic acid is and at infinite dilution is , The dissociation constant of this acid is -
1
2
3
4
36
PYQ 2009
medium
chemistry ID: neet-ug-
The dissociation constants for acetic acid and at are and respectively. The equilibrium constant for the equilibrium would be :
1
2
3
4
37
PYQ 2010
medium
chemistry ID: neet-ug-
In a buffer solution containing equal concentration of and HB, the for is . The pH of buffer solution is
1
10
2
7
3
6
4
4
38
PYQ 2010
medium
chemistry ID: neet-ug-
What is in mol/L of a solution that is in and in ?
1
2
3
4
39
PYQ 2010
medium
chemistry ID: neet-ug-
The reaction is begun with the concentrations of and both at an intial value of . When equilibrium is reached, the concentration of is measured and found to be . The value for the equilibrium constant for this reaction is given by the expression.
1
2
3
4
40
PYQ 2012
medium
chemistry ID: neet-ug-
of a saturated solution of is . The value of solubility product of is
1
2
3
4
41
PYQ 2012
medium
chemistry ID: neet-ug-
Buffer solutions have constant acidity and alkalinity because
1
these give unionised acid or base on reaction with added acid or alkali
2
acids and alkalies in these solutions are shielded from attack by other ions
3
they have large excess of or ions
4
they have fixed value of pH
42
PYQ 2012
medium
chemistry ID: neet-ug-
Given the reaction between 2 gases represented by and to give the compound . At equilibrium, the concentration of of of If the reaction takes place in a sealed vessel at , then the value of will be :
1
1.9
2
0.62
3
4.5
4
2
43
PYQ 2013
medium
chemistry ID: neet-ug-
KMnO4 can be prepared from K2MnO4 as per the reaction:

The reaction can go to completion by removing OH- ions by adding
1
HCl
2
KOH
3
CO2
4
SO2
44
PYQ 2013
medium
chemistry ID: neet-ug-
At the of water is its value at . What will be the pH of neutral solution ?
1
7
2
7.87
3
5.13
4
6.13
45
PYQ 2013
medium
chemistry ID: neet-ug-
The values of of and are and respectively at . If the mixture of these two is washed with water, what is the concentration of ions in water?
1
2
3
4
46
PYQ 2014
medium
chemistry ID: neet-ug-
For a given exothermic reaction, and are the equilibrium constants at temperatures and , respectively. Assuming that heat of reaction is constant in temperature range between and , it is readily observed that :-
1
2
3
4
47
PYQ 2014
medium
chemistry ID: neet-ug-
Using the Gibbs energy change, , for the following reaction, the of in water at C is ( )
1
2
3
4
48
PYQ 2014
medium
chemistry ID: neet-ug-
Which of the following salts will give highest in water?
1
2
3
4
49
PYQ 2015
medium
chemistry ID: neet-ug-
If the equilibrium constant for is K, the equilibrium constant for will be :
1
2
3
4
50
PYQ 2015
medium
chemistry ID: neet-ug-
What is the pH of the resulting solution when equal volumes of and are mixed ?
1
7
2
1.04
3
12.65
4
2
51
PYQ 2015
medium
chemistry ID: neet-ug-
Aqueous solution of which of the following compounds is the best conductor of electric current?
1
Ammonia,
2
Fructose,
3
Acetic acid,
4
Hydrochloric acid, HCl
52
PYQ 2017
easy
chemistry ID: neet-ug-
litre container at contains at pressure and an excess of SrO (neglect the volume of solid SrO). The volume of the containers is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when pressure of attains its maximum value, will be (Given that
1
10 litre
2
4 litre
3
2 litre
4
5 litre
53
PYQ 2017
medium
chemistry ID: neet-ug-
Concentration of the ions in a saturated solution of is Solubility product of is :-
1
2
3
4
54
PYQ 2017
easy
chemistry ID: neet-ug-
The following equilibrium constants are given The equilibrium constant for the oxidation of the by oxygen to give is:
1
2
3
4
55
PYQ 2018
easy
chemistry ID: neet-ug-
Which one of the following conditions will favour maximum formation of the product in the reaction,
A2(g) + B2(g) ⇌ X2(g) ΔrH = – X kJ ?
56
PYQ 2018
medium
chemistry ID: neet-ug-
The solubility of in water is at . The value of its solubility product will be (Given molar mass of )
1
2
3
4
57
PYQ 2019
medium
chemistry ID: neet-ug-
For a cell involving one electron at 298 K, the equilibrium constant for the cell reaction is: [Given that at ]
1
2
3
4
58
PYQ 2019
medium
chemistry ID: neet-ug-
Which will make basic buffer?
1
2
3
4
59
PYQ 2019
medium
chemistry ID: neet-ug-
Conjugate base for Bronsted acids and are:
1
and , respectively
2
and , respectively
3
and , respectively
4
and respectively
60
PYQ 2020
medium
chemistry ID: neet-ug-
Hydrolysis of sucrose is given by the following reaction.

If the equilibrium constant is at 300K, the value of at the same temperature will be :
1
2
3
4
61
PYQ 2020
medium
chemistry ID: neet-ug-
Find out the solubility of in 0.1 M NaOH. Given that the ionic product of is
1
2
3
4
62
PYQ 2022
medium
chemistry ID: neet-ug-

3O2 (g) ⇌ 2O3(g) for the above reaction at 298 K, Kc is found to be 3.0 x 10-59. If the conc. of O2 at equilibrium is 0.040 M then concentration of O3 in M is

1
4.38 x 10-32
2
1.9 x 10-63
3
2.4 x 1031
4
1.2 x 1021
63
PYQ 2022
medium
chemistry ID: neet-ug-
The pH of the solution containing 50 mL each of 0.10 M sodium acetate and 0.01 M acetic acid is
[Given pKa of CH3COOH = 4.57]
1
5.57
2
3.57
3
4.57
4
2.57
64
PYQ 2023
medium
chemistry ID: neet-ug-
Amongst the given options which of the following molecules/ion acts as a Lewis acid?
1

H2O

2

BF3

3

OH-

4

NH3

65
PYQ 2024
hard
chemistry ID: neet-ug-
Consider the following reaction in a sealed vessel at equilibrium with concentrations of
N2 = 3.0 × 10–3 M, O2 = 4.2 × 10–3 M and NO = 2.8 × 10–3 M.
2NO(g)⇋N2(g) + O2(g)
If 0.1 mol L–1 of NO(g) is taken in a closed vessel, what will be degree of dissociation (a) of NO(g) at equilibrium?
1
0.00889
2
0.0889
3
0.8889
4
0.717