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AP-EAPCET SERIES
Chemistry

Law Of Chemical Equilibrium And Equilibrium Constant

33 previous year questions.

Volume: 33 Ques
Yield: High

High-Yield Trend

13
2025
2
2024
9
2023
9
2022

Chapter Questions
33 MCQs

01
PYQ 2022
medium
chemistry ID: ap-eapce
At 25 C, the solubility product of MCl is . What is its molar solubility in 0.1 M NaCl solution at same temperature?
1
0.1 M
2
0.05 M
3
M
4
M
02
PYQ 2022
medium
chemistry ID: ap-eapce
For the reaction , the favorable conditions for the forward reaction are:
1
Low and low
2
Low and high
3
High and low
4
High and high
03
PYQ 2022
medium
chemistry ID: ap-eapce
Equal volumes of 0.5 N acetic acid and 0.5 N sodium acetate are mixed. What is the pH of resultant solution?
( of acetic acid = 4.75)
1
4.85
2
4.65
3
4.75
4
7.0
04
PYQ 2022
medium
chemistry ID: ap-eapce
The formation of ammonia from its constituent elements is an exothermic reaction. \ The effect of increase in temperature on the reaction equilibrium is:
1
The rate of the forward reaction becomes zero
2
No effect of temperature
3
Forward reaction is favored
4
Backward reaction is favored
05
PYQ 2022
medium
chemistry ID: ap-eapce
The pH of 0.01 N lime water is
1
13.09
2
10
3
12
4
9.8
06
PYQ 2022
medium
chemistry ID: ap-eapce
Which of the following does not show disproportionation reaction?
1
ClO
2
ClO
3
ClO
4
ClO
07
PYQ 2022
medium
chemistry ID: ap-eapce
A reaction gas mixture contains 50%, 30%, 20% of A, B and C by volume respectively. The mixture undergoes the following reactions: Choose the correct answer if the reaction completes.
1
C will be completely exhausted.
2
A will be completely exhausted.
3
B will be completely exhausted.
4
will be completely exhausted.
08
PYQ 2022
medium
chemistry ID: ap-eapce
Which of the following expression is correct?
1
2
3
4
09
PYQ 2022
medium
chemistry ID: ap-eapce
The solubility products of NiS, ZnS, CdS and HgS are , , and respectively. An aqueous solution contains Ni , Zn , Cd , and Hg of equal concentration. H S gas was passed into this solution very slowly. The first and the last ions that precipitate as sulphides are respectively
1
Ni , Hg
2
Hg , Cd
3
Zn , Hg
4
Hg , Ni
10
PYQ 2023
medium
chemistry ID: ap-eapce
Observe the following species How many Lewis bases are present in the above list?
1
2
2
5
3
4
4
3
11
PYQ 2023
easy
chemistry ID: ap-eapce
One mole of is heated to till the following equilibrium is obtained The equilibrium constant of this reaction is . After reaching the equilibrium, 0.5 moles of A (g) is added and heated. The equilibrium is again established. The value of is
12
PYQ 2023
medium
chemistry ID: ap-eapce
Observe the following equilibrium $ $ yellow \hspace{1cm colourless \hspace{1cm} deep red}
Addition of aqueous oxalic acid solution to the above equilibrium
1
Shifts the equilibrium towards the formation of
2
Deep red color increases
3
Intensity of deep red color decreases
4
No change in equilibrium
13
PYQ 2023
medium
chemistry ID: ap-eapce
Given below are two statements
Statement I: The changes in pH with temperature are so small that we often ignore it
Statement II: When the hydrogen ion concentration changes by a factor of 100, the pH changes by one unit
In the light of above statements, identify the correct answer from the options given below
1
Both statements I and II are correct.
2
Both statements I and II are not correct.
3
Statement I is correct but statement II is not correct.
4
Statement I is not correct but statement II is correct.
14
PYQ 2023
medium
chemistry ID: ap-eapce
At T(K), the for the reaction is 0.04 atm. The equilibrium pressure (in atm) of when it is placed in a flask at 4 atm pressure and allowed to come to above equilibrium is
1

2

3

4

15
PYQ 2023
medium
chemistry ID: ap-eapce
One mole of was heated in a 1L closed flask at 500 K. At equilibrium, 0.1 mole of was formed. What is its (in atm)? (Given R = 0.082 L atm mol K )
1
2
3
4
16
PYQ 2023
medium
chemistry ID: ap-eapce
One mole H\textsubscript{2O(g) and one mole CO(g) are taken in 1L flask and heated to 725K. At equilibrium, 40\% (by mass) of water reacted with CO(g) as follows:} Its value is
1
2.22
2
0.444
3
4.44
4
0.222
17
PYQ 2023
medium
chemistry ID: ap-eapce

At 1000 K, the value of for the below reaction is . Value of (in atm) is (given )

1

2

3

4

18
PYQ 2023
medium
chemistry ID: ap-eapce
At 300 K, the total pressure of the following system is 2 atm, at equilibrium: The atoms of A occupy 20% volume at STP. The of the system is approximately (Given: R = 0.082 L atm mol K , STP volume of 1 mole of a gas = 22.7 L)
1
2
3
4

19
PYQ 2024
easy
chemistry ID: ap-eapce

For the reaction:

The equilibrium constant is given as 99.0. In a 1 L closed flask, two moles of is heated to . What is the concentration of (in mol L ) at equilibrium?

1

2

3

4

20
PYQ 2024
medium
chemistry ID: ap-eapce
The equilibrium constant for the dissociation of HI at 773 K is:
1

2

3

4

21
PYQ 2025
medium
chemistry ID: ap-eapce
At T(K), consider the following gaseous reaction, which is in equilibrium: N O NO O . What is the fraction of N O decomposed at constant volume and temperature, if the initial pressure is 300 mm Hg and pressure at equilibrium is 480 mm Hg? (Assume all gases as ideal)
1
0.2
2
0.6
3
0.4
4
0.8
22
PYQ 2025
medium
chemistry ID: ap-eapce
At 25 C, of acetic acid is . What is the percentage of ionization of 0.02 M acetic acid at this temperature?
1
3
2
4.242
3
5
4
1.414
23
PYQ 2025
medium
chemistry ID: ap-eapce
At 298 K, the value of K for N O (g) 2NO (g) is 0.113 atm. The partial pressure of N O at equilibrium is 0.2 atm. What is the partial pressure (in atm) of NO at equilibrium ?
1

2

3

4

24
PYQ 2025
medium
chemistry ID: ap-eapce

At 700 K, the equilibrium constant for the reaction is 0.2 mol L . What is the value of for the reverse reaction?

1
5
2
0.2
3
0.04
4

25
PYQ 2025
easy
chemistry ID: ap-eapce

For the reaction at 298 K, the enthalpy change . What happens to the equilibrium when temperature is increased?

1
Shifts to the right
2
Shifts to the left
3
Remains unchanged
4
Pressure increases
26
PYQ 2025
medium
chemistry ID: ap-eapce
At T(K), the equilibrium constant for the reaction is . At equilibrium, if the molar concentrations of and are 0.25 M and 0.06 M respectively, the equilibrium concentration of dinitrogen (in mol L ) is:
1
2.84
2
3.84
3
8.34
4
4.82
27
PYQ 2025
medium
chemistry ID: ap-eapce
At temperature , the equilibrium constant for the reaction: $ \mathrm{AO_2} \mathrm{BO_2} \mathrm{AO_3} \mathrm{BO} T(K) \mathrm{AO_2} \mathrm{AO_3} \mathrm{AO_2} \mathrm{BO_2}$ at equilibrium is 0.8
1
I only
2
I, III only
3
II, III only
4
I, II, III
28
PYQ 2025
medium
chemistry ID: ap-eapce
The following equilibrium is established at STP:
Atoms of B occupy 20% of total volume at STP. The total pressure of the system is 1 bar. What is its ? (STP volume = 22.7 L)
1
0.05
2
0.1
3
0.5
4
0.025
29
PYQ 2025
medium
chemistry ID: ap-eapce
At 298 K, the value of for the reaction A O (g) 2AO (g) is mol L . What is the approximate value for this reaction?
Given: L atm mol K
1
24.4x
2
12.2x
3
4
30
PYQ 2025
medium
chemistry ID: ap-eapce
When 30 mL of 0.2 M is added to 30 mL of 2 M solution. If the pH of the buffer formed is 8.2, what is the of ?
1
2
3
4
31
PYQ 2025
medium
chemistry ID: ap-eapce
At T(K), the following gaseous equilibrium is established. W + X Y + Z The initial concentration of W is two times to the initial concentration of X. The system is heated to T(K) to establish the equilibrium. At equilibrium the concentration of Y is four times to the concentration of X. What is the value of ?
1
0.375
2
1.333
3
2.666
4
5.333
32
PYQ 2025
medium
chemistry ID: ap-eapce
The molar solubility of PbI₂ in 0.2 M Pb(NO₃)₂ solution in terms of (solubility product) is
1
2
3
4
33
PYQ 2025
medium
chemistry ID: ap-eapce
Consider the following:
Statement I:
acts as an oxidising as well as reducing agent in both acidic and basic media.
Statement II:
10V sample means it contains 6% (w/v)
1
Both statement-I and statement-II are correct
2
Statement-I is correct, but statement-II is not correct
3
Statement-I is not correct, but statement-II is correct
4
Both statement-I and statement-II are not correct