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Previous year question hub

Chemical Equilibrium - Physical Chemistry - Chemistry Previous Year Questions

Practice Chemical Equilibrium - Physical Chemistry - Chemistry previous year questions organised from real papers, with year-wise coverage and clear topic navigation.

26Papers
21Years
42Questions
1Topics

Chemical Equilibrium question pattern

Every graph below is calculated only from this selection.

Questions by year

Year-wise coverage for Chemical Equilibrium. Each bar uses a separate theme-derived color.

Difficulty distribution

How the classified questions are distributed by difficulty.

Not classified 39 92.9%
Easy 2 4.8%
Medium 1 2.4%

Question type distribution

MCQ, numerical, multiple-select and other formats found in these papers.

Multiple Choices 42 100%

Subject weightage

Top subjects by unique question coverage.

Chemistry
42 Qs

Most asked topics

Top topics across the included previous year papers.

Physical Chemistry
42 Qs

Subtopic coverage

Top subtopics inside this exact selection.

Chemical Equilibrium
42 Qs

Paper coverage

Question coverage for the most populated papers. Every active PYP paper remains listed below.

NEET 2026
1 Qs
NEET 2025
2 Qs
NEET 2024
3 Qs
NEET 2024 RE EXAMINATION
2 Qs
NEET 2023 MANIPUR
1 Qs
NEET 2022 Phase 1
1 Qs
NEET 2022 PHASE 2
1 Qs
AIIMS 2018
2 Qs
NEET 2018
1 Qs
NEET 2017
2 Qs
NEET 2016 PHASE 1
1 Qs
AIPMT 2015 Cancelled Paper
2 Qs
AIPMT 2015
1 Qs
AIPMT 2014
3 Qs
AIPMT 2012 MAINS
2 Qs
AIPMT 2011 PRELIMS
2 Qs
AIPMT 2010 MAINS
1 Qs
AIPMT 2010 PRELIMS
1 Qs
AIPMT 2009
1 Qs
AIPMT 2008
4 Qs
AIPMT 2007
1 Qs
AIPMT 2006
1 Qs
AIPMT 2005
1 Qs
AIPMT 2003
2 Qs
AIPMT 2002
1 Qs
AIPMT 2000
2 Qs

Included previous year papers

Newest papers appear first. Sort by year, question coverage or name.

PaperYear / sessionQuestions in this viewOpen
NEET 202620261View paper
NEET 202520252View paper
NEET 202420243View paper
NEET 2024 RE EXAMINATION20242View paper
NEET 2023 MANIPUR20231View paper
NEET 2022 Phase 120221View paper
NEET 2022 PHASE 220221View paper
AIIMS 201820182View paper
NEET 201820181View paper
NEET 201720172View paper
NEET 2016 PHASE 120161View paper
AIPMT 201520151View paper
AIPMT 2015 Cancelled Paper20152View paper
AIPMT 201420143View paper
AIPMT 2012 MAINS20122View paper
AIPMT 2011 PRELIMS20112View paper
AIPMT 2010 MAINS20101View paper
AIPMT 2010 PRELIMS20101View paper
AIPMT 200920091View paper
AIPMT 200820084View paper
AIPMT 200720071View paper
AIPMT 200620061View paper
AIPMT 200520051View paper
AIPMT 200320032View paper
AIPMT 200220021View paper
AIPMT 200020002View paper

All Chemical Equilibrium previous year questions

Practice every matching question in batches of 20, with every available option.

1
2000 · Chemistry · Physical Chemistry · Chemical Equilibrium
AIPMT 2000
For any reversible reaction, if we increase concentration of the reactants, then effect on equilibrium constant
A
depends on amount of concentration
B
unchange
C
decrease
D
increase
Open complete paper
2
2000 · Chemistry · Physical Chemistry · Chemical Equilibrium
AIPMT 2000
Equilibrium constant Kp for following reaction
MgCO3(s) \(\rightleftharpoons\) MgO(s) + CO2(g)
A
Kp = PCO2
B
Kp = PCO2 \(\times\) \({{{P_{C{O_2}}} \times {P_{MgO}}} \over {{P_{MgC{O_3}}}}}\)
C
Kp = \({{{P_{C{O_2}}} + {P_{MgO}}} \over {{P_{MgC{O_3}}}}}\)
D
Kp = \({{{P_{MgC{O_3}}}} \over {{P_{C{O_2}}} + {P_{MgO}}}}\)
Open complete paper
3
2002 · Chemistry · Physical Chemistry · Chemical Equilibrium
AIPMT 2002
Reaction BaO2(g) \(\rightleftharpoons\) BaO(s) + O2(g); \(\Delta\)H = +ve. In equilibrium condition, pressure of O2 depends on
A
increase mass of BaO2
B
increase mass of BaO
C
increase temperature on equilibrium
D
increase mass of BaO2 and BaO both.
Open complete paper
4
2003 · Chemistry · Physical Chemistry · Chemical Equilibrium
AIPMT 2003
The reaction quotient (Q) for the reaction

N2(g) + 3H2(g) \(\rightleftharpoons\) 2NH3(g) is given by

\(Q = {{{{\left[ {N{H_3}} \right]}^2}} \over {\left[ {{N_2}} \right]{{\left[ {{H_2}} \right]}^3}}}\).

The reaction will proceed from right to left if
A
Q = Kc
B
Q < Kc
C
Q > Kc
D
Q = 0
Open complete paper
5
2003 · Chemistry · Physical Chemistry · Chemical Equilibrium
AIPMT 2003
The equilibrium constants of the following are

N2 + 3H2 \(\rightleftharpoons\) 2NH3;     K1

N2 + O2 \(\rightleftharpoons\) 2NO;     K2

H2 + \({1 \over 2}\)O2 \(\rightleftharpoons\) H2O;     K3

The equilibrium constant (K) of the reaction :

2NH3 + \({5 \over 2}\) O2 \(\rightleftharpoons\) 2NO + 3H2O will be
A
K2K33/K1
B
K2K3/K1
C
K23K3/K1
D
K1K33/K2
Open complete paper
6
2005 · Chemistry · Physical Chemistry · Chemical Equilibrium
AIPMT 2005
Equilibrium constants K1 and K2 for the following equilibriam:

AIPMT 2005 Chemistry - Chemical Equilibrium Question 17 English
are related as
A
K2 = 1/K12
B
K2 = K12
C
K2 = 1/K1
D
K2 = K1/2
Open complete paper
7
2006 · Chemistry · Physical Chemistry · Chemical Equilibrium
AIPMT 2006
For the reaction :
CH4(g) + 2O2(g) \(\rightleftharpoons\) CO2(g) + 2H2O(l),
\(\Delta\)Hr = \(-\) 170.8 kJ mol\(-\)1.
Which of the following statements is not true?
A
The reaction is exothermic.
B
At equilibrium, the concentrations of CO2(g) and H2O(l) are not equal.
C
The equilibrium constant for the reaction is given by Kp = \({{\left[ {C{O_2}} \right]} \over {\left[ {C{H_4}} \right]\left[ {{O_2}} \right]}}\)
D
Addition of CH4(g) or O2(g) at equilibrium will cause a shift to the right.
Open complete paper
8
2007 · Chemistry · Physical Chemistry · Chemical Equilibrium
AIPMT 2007
The equilibrium constants of the following are

N2 + 3H2 \(\rightleftharpoons\) 2NH3;     K1

N2 + O2 \(\rightleftharpoons\) 2NO;     K2

H2 + \({1 \over 2}\)O2 \(\rightleftharpoons\) H2O;     K3

The equilibrium constant (K) of the reaction :

2NH3 + \({5 \over 2}\) O2 \(\rightleftharpoons\) 2NO + 3H2O will be
A
K2K33/K1
B
K2K3/K1
C
K23K3/K1
D
K1K33/K2
Open complete paper
9
2008 · Chemistry · Physical Chemistry · Chemical Equilibrium
AIPMT 2008
The value of equilibrium constant of the reaction
HI(g) \(\rightleftharpoons\) \({1 \over 2}\)H2(g) + \({1 \over 2}\)I2(g)
is 8.0. The The equilibrium constant of the reaction
H2(g) + I2(g) \(\rightleftharpoons\) 2HI(g) will be
A
16
B
1/8
C
1/16
D
1/64
Open complete paper
10
2008 · Chemistry · Physical Chemistry · Chemical Equilibrium
AIPMT 2008
The values of for the reactions,

X \(\rightleftharpoons\) Y + Z      . . . .(i)
A \(\rightleftharpoons\) 2B       . . . .(ii)

are in the ratio 9 : 1. If degree of dissociation of X and A be equal, then total pressure at equilibrium (i) and (ii) are in the ratio
A
36 : 1
B
1 : 1
C
3 : 1
D
1 : 9
Open complete paper
11
2008 · Chemistry · Physical Chemistry · Chemical Equilibrium
AIPMT 2008
The dissociation equilibrium of a gass AB2 can be represented as :
2AB2(g) \(\rightleftharpoons\) 2AB(g) + B2(g)
The degree of dissociation is x and is small compared to 1. The expression relating the degree of dissociation (x) with equilibrium constant Kp and total pressure P is
A
(2Kp/P)1/2
B
(Kp/P)
C
(2Kp/P)
D
(2Kp/P)1/3
Open complete paper
12
2008 · Chemistry · Physical Chemistry · Chemical Equilibrium
AIPMT 2008
If the concentration of OH\(-\) ions in the reaction
Fe(OH)3(s) \(\rightleftharpoons\) Fe3+(aq) + 3OH\(-\)(aq)
is decreased by 1/4 times, then equilibrium concentration of Fe3+ will increase by
A
64 times
B
4 times
C
8 times
D
16 times
Open complete paper
13
2009 · Chemistry · Physical Chemistry · Chemical Equilibrium
AIPMT 2009
The dissociation constants for acetic acid and HCN at 25oC are 1.5 \(\times\) 10\(-\)5 and 4.5 \(\times\) 10\(-\)10 respectively. The equilibrium constant for the equilibrium
CN\(-\) + CH3COOH \(\rightleftharpoons\) HCN + CH3COO\(-\) would be
A
3.0 \(\times\) 10\(-\)5
B
3.0 \(\times\) 10\(-\)4
C
3.0 \(\times\) 104
D
3.0 \(\times\) 105
Open complete paper
14
2010 · Chemistry · Physical Chemistry · Chemical Equilibrium
AIPMT 2010 MAINS
The reaction,
2A(g) + B(g) \(\rightleftharpoons\) 3C(g) + D(g)
is begun with the concentrations of A and B both at an initial value of 1.00 M. When equilibrium is reached, the concentration of D is measuread and found to be 0.25 M. The value for the equilibrium constant for this reaction is given by the expression
A
[(0.75)3 (0.25)] \(\div\) [(1.00)2 (1.00)]
B
[(0.75)3 (0.25)] \(\div\) [(0.50)2 (0.75)]
C
[(0.75)3 (0.25)] \(\div\) [(0.50)2 (0.25)]
D
[(0.75)3 (0.25)] \(\div\) [(0.75)2 (0.25)]
Open complete paper
15
2010 · Chemistry · Physical Chemistry · Chemical Equilibrium
AIPMT 2010 PRELIMS
In which of the following equilibrium Kc and Kp are not equal?
A
2NO(g) \(\rightleftharpoons\) N2(g) + O2(g)
B
SO2(g) + NO2(g) \(\rightleftharpoons\) SO3(g) + NO(g)
C
H2(g) + I2(g) \(\rightleftharpoons\) 2HI(g)
D
2C(s) + O2(g) \(\rightleftharpoons\) 2CO2(g)
Open complete paper
16
2011 · Chemistry · Physical Chemistry · Chemical Equilibrium
AIPMT 2011 PRELIMS
The value of \(\Delta\)H for the reaction
X2(g) + 4Y2(g) \(\rightleftharpoons\) 2XY4(g)
is less than zero. Formation of XY4(g) will be favoured at
A
high temperature and high pressure
B
low pressure and low temperature
C
high temperature and low pressure
D
high pressure and low temperature
Open complete paper
17
2011 · Chemistry · Physical Chemistry · Chemical Equilibrium
AIPMT 2011 PRELIMS
For the reaction, N2(g) + O2(g) \(\rightleftharpoons\) 2NO(g), the equilibrium constant is K1. The equilibrium constant is K2 for the reaction,
2NO(g) + O2(g) \(\rightleftharpoons\) 2NO2(g)
What is K for the reaction,
NO2(g) \(\rightleftharpoons\) \({1 \over 2}\)N2(g) + O2(g)
A
\({1 \over {2{K_1}{K_2}}}\)
B
\({1 \over {4{K_1}{K_2}}}\)
C
\({\left[ {{1 \over {{K_1}{K_2}}}} \right]^{1/2}}\)
D
\({1 \over {{K_1}{K_2}}}\)
Open complete paper
18
2012 · Chemistry · Physical Chemistry · Chemical Equilibrium
AIPMT 2012 MAINS
Given the reaction between 2 gases represented by A2 and B2 to give the compound AB(g),

A2(g) + B2(g) \(\rightleftharpoons\) 2AB(g)

At equilibrium, the concentration of
A2 = 3.0 \(\times\) 10\(-\)3 M, of B2 = 4.2 \(\times\) 10\(-\)3 M, of AB = 2.8 \(\times\) 10\(-\)3 M
If the reaction takes place in a sealed vessel at 527oC, then the value of Kc will be
A
2.0
B
1.9
C
0.62
D
4.5
Open complete paper
19
2012 · Chemistry · Physical Chemistry · Chemical Equilibrium
AIPMT 2012 MAINS
Given that the equilibrium constant for the reaction,
2SO2(g) + O2(g) \(\rightleftharpoons\) 2SO3(g)
has a value of 278 at a particular temperature. What is the value of the equilibrium constant for the following reaction at the same temperature ?
SO3(g) \(\rightleftharpoons\) SO2(g) + \({1 \over 2}\) O2(g)
A
1.8 \(\times\) 10\(-\)3
B
3.6 \(\times\) 10\(-\)3
C
6.0 \(\times\) 10\(-\)2
D
1.3 \(\times\) 10\(-\)5
Open complete paper
20
2014 · Chemistry · Physical Chemistry · Chemical Equilibrium
AIPMT 2014
For the reversible reaction,
N2(g) + 3H2(g) \(\rightleftharpoons\) 2NH3(g) + heat

The equilibrium shifts in forward direction
A
by increasing the concentration of NH3(g)
B
by decreasing the pressure
C
by decreasing the concentrations of N2(g) and H2(g)
D
by increasing pressure and decreasiing temperature.
Open complete paper

Showing 20 of 42 questions