Chemical Equilibrium PYQs - Last 10 Years
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ChemistryPhysical Chemistry2017-2026
Practice 101 JEE Main Chemistry questions from Chemical Equilibrium. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.
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59 in last 5 years101 in last 10 years
Last 10 Years Chemical Equilibrium Questions
Showing 50 of 101 filtered questions.
1Chemical Equilibrium
4.0 moles of argon and 5.0 moles of PCl5 are introduced into an evacuated flask of 100 litre capacity at 610 K. The system is allowed to equilibrate. At equilibrium, the total pressure of mixture was found to be 6.0 atm. The Kp for the reac...
MCQ+4 / -12022
2Chemical Equilibrium
At \(600 \mathrm{~K}, 2 \mathrm{~mol}\) of \(\mathrm{NO}\) are mixed with \(1 \mathrm{~mol}\) of \(\mathrm{O}_{2}\).
\(2 \mathrm{NO}_{(\mathrm{g})}+\mathrm{O}_{2}(\mathrm{g}) \rightleftarrows 2 \mathrm{NO}_{2}(\mathrm{g})\)
The reaction occ...
\(2 \mathrm{NO}_{(\mathrm{g})}+\mathrm{O}_{2}(\mathrm{g}) \rightleftarrows 2 \mathrm{NO}_{2}(\mathrm{g})\)
The reaction occ...
INTEGER+4 / -12022
3Chemical Equilibrium
2NOCl(g) \(\rightleftharpoons\) 2NO(g) + Cl2(g)
In an experiment, 2.0 moles of NOCl was placed in a one-litre flask and the concentration of NO after equilibrium established, was found to be 0.4 mol/L. The equilibrium constant at 30$$^\circ...
In an experiment, 2.0 moles of NOCl was placed in a one-litre flask and the concentration of NO after equilibrium established, was found to be 0.4 mol/L. The equilibrium constant at 30$$^\circ...
INTEGER+4 / -12022
4Chemical Equilibrium
40% of HI undergoes decomposition to H2 and I2 at 300 K. \(\Delta\)G\(^\Theta\) for this decomposition reaction at one atmosphere pressure is __________ J mol\(-\)1. [nearest integer]
(Use R = 8.31 J K\(-\)1 mol\(-\)1 ; log 2 = 0.3010, ln ...
(Use R = 8.31 J K\(-\)1 mol\(-\)1 ; log 2 = 0.3010, ln ...
INTEGER+4 / -12022
5Chemical Equilibrium
At \(298 \mathrm{~K}\), the equilibrium constant is \(2 \times 10^{15}\) for the reaction :
\(\mathrm{Cu}(\mathrm{s})+2 \mathrm{Ag}^{+}(\mathrm{aq}) \rightleftharpoons \mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{Ag}(\mathrm{s})\)
The equilibriu...
\(\mathrm{Cu}(\mathrm{s})+2 \mathrm{Ag}^{+}(\mathrm{aq}) \rightleftharpoons \mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{Ag}(\mathrm{s})\)
The equilibriu...
INTEGER+4 / -12022
6Chemical Equilibrium
The standard free energy change (\(\Delta\)G\(^\circ\)) for 50% dissociation of N2O4 into NO2 at 27\(^\circ\)C and 1 atm pressure is \(-\) x J mol\(-\)1. The value of x is ___________. (Nearest Integer)
[Given : R = 8.31 J K\(-\)1 mol\(-\)1...
[Given : R = 8.31 J K\(-\)1 mol\(-\)1...
INTEGER+4 / -12022
7Chemical Equilibrium
2O3(g) \(\rightleftharpoons\) 3O2(g)
At 300 K, ozone is fifty percent dissociated. The standard free energy change at this temperature and 1 atm pressure is (\(-\)) ____________ J mol\(-\)1. (Nearest integer)
[Given : ln 1.35 = 0.3 and R = ...
At 300 K, ozone is fifty percent dissociated. The standard free energy change at this temperature and 1 atm pressure is (\(-\)) ____________ J mol\(-\)1. (Nearest integer)
[Given : ln 1.35 = 0.3 and R = ...
INTEGER+4 / -12022
8Chemical Equilibrium
For a reaction at equilibrium
A(g) \(\rightleftharpoons\) B(g) + \({1 \over 2}\) C(g)
the relation between dissociation constant (K), degree of dissociation (\(\alpha\)) and equilibrium pressure (p) is given by :
A(g) \(\rightleftharpoons\) B(g) + \({1 \over 2}\) C(g)
the relation between dissociation constant (K), degree of dissociation (\(\alpha\)) and equilibrium pressure (p) is given by :
MCQ+4 / -12022
9Chemical Equilibrium
PCl5 dissociates as
PCl5(g) \(\rightleftharpoons\) PCl3(g) + Cl2(g)
5 moles of PCl5 are placed in a 200 litre vessel which contains 2 moles of N2 and is maintained at 600 K. The equilibrium pressure is 2.46 atm. The equilibrium constant Kp ...
PCl5(g) \(\rightleftharpoons\) PCl3(g) + Cl2(g)
5 moles of PCl5 are placed in a 200 litre vessel which contains 2 moles of N2 and is maintained at 600 K. The equilibrium pressure is 2.46 atm. The equilibrium constant Kp ...
INTEGER+4 / -12022
10Chemical Equilibrium
PCl5 \(\rightleftharpoons\) PCl3 + Cl2Kc = 1.8443.0 moles of PCl5 is introduced in a 1 L closed reaction vessel at 380 K. The number of moles of PCl5 at equilibrium is ______________ \(\times\) 10\(-\)3. (Round off to the Nearest Integer)
INTEGER+4 / -12021
11Chemical Equilibrium
The equilibrium constant for the reactionA(s) \(\rightleftharpoons\) M(s) + \({1 \over 2}\)O2(g)is Kp = 4. At equilibrium, the partial pressure of O2 is _________ atm. (Round off to the nearest integer)
INTEGER+4 / -12021
12Chemical Equilibrium
The number of moles of NH3, that must be added to 2L of 0.80 M AgNO3 in order to reduce the concentration of Ag+ ions to 5.0 \(\times\) 10\(-\)8 M (Kformation for [Ag(NH3)2]+ = 1.0 \(\times\) 108) is ____________. (Nearest integer)[Assume n...
INTEGER+4 / -12021
13Chemical Equilibrium
When 5.1 g of solid NH4HS is introduced into a two litre evacuated flask at 27\(^\circ\)C, 20% of the solid decomposes into gaseous ammonia and hydrogen sulphide. The Kp for the reaction at 27\(^\circ\)C is x \(\times\) 10\(-\)2. The value ...
INTEGER+4 / -12021
14Chemical Equilibrium
A homogeneous ideal gaseous reaction \(A{B_{2(g)}} \rightleftharpoons {A_{(g)}} + 2{B_{(g)}}\) is carried out in a 25 litre flask at 27\(^\circ\)C. The initial amount of AB2 was 1 mole and the equilibrium pressure was 1.9 atm. The value of ...
INTEGER+4 / -12021
15Chemical Equilibrium
The OH\(-\) concentration in a mixture of 5.0 mL of 0.0504 M NH4Cl and 2 mL of 0.0210 M NH3 solution is x \(\times\) 10\(-\)6 M. The value of x is ___________. (Nearest integer)[Given Kw = 1 \(\times\) 10\(-\)14 and Kb = 1.8 \(\times\) 10$$...
INTEGER+4 / -12021
16Chemical Equilibrium
The reaction rate for the reaction[PtCl4]2\(-\) + H2O \(\rightleftharpoons\) [Pt(H2O)Cl3]\(-\) + Cl\(-\)was measured as a function of concentrations of different species. It was observed that $${{ - d\left[ {{{\left[ {PtC{l_4}} \right]}^{2 ...
INTEGER+4 / -12021
17Chemical Equilibrium
The equilibrium constant Kc at 298 K for the reaction A + B \(\rightleftharpoons\) C + D is 100. Starting with an equimolar solution with concentrations of A, B, C and D all equal to 1M, the equilibrium concentration of D is ___________ $$\...
INTEGER+4 / -12021
18Chemical Equilibrium
For the reactionA + B \(\rightleftharpoons\) 2Cthe value of equilibrium constant is 100 at 298 K. If the initial concentration of all the three species is 1 M each, then the equilibrium concentration of C is x \(\times\) 10\(-\)1 M. The val...
INTEGER+4 / -12021
19Chemical Equilibrium
Assuming that Ba(OH)2 is completely ionised in aqueous solution under the given conditions the concentration of H3O+ ions in 0.005 M aqueous solution of Ba(OH)2 at 298 K is ______________ \(\times\) 10\(-\)12 mol L\(-\)1. (Nearest integer)
INTEGER+4 / -12021
20Chemical Equilibrium
For the reaction A(g) \(\to\) B(g) the value of the equilibrium constant at 300 K and 1 atm is equal to 100.0. The value of \(\Delta\)rG for the reaction at 300 K and 1 atm in J mol-1 is – xR, where x is _______. (Rounded off to the near...
INTEGER+4 / -12021
21Chemical Equilibrium
The stepwise formation of \({\left[ {Cu{{\left( {N{H_3}} \right)}_4}} \right]^{2 + }}\) is given below:
The value of stability constants K1, K2, K3 and K4 are 104, 1.58 x 103, 5 x 102 and 102 respectively. The overall equilibrium constants...
The value of stability constants K1, K2, K3 and K4 are 104, 1.58 x 103, 5 x 102 and 102 respectively. The overall equilibrium constants...
INTEGER+4 / -12021
22Chemical Equilibrium
At 1990 K and 1 atm pressure, there are equal number of Cl2, molecules and Cl atoms in the
reaction mixture. The value of Kp for the reaction Cl2 (g) \(\rightleftharpoons\) 2Cl(g) under the above conditions
is x \(\times\) 10-1.
The val...
reaction mixture. The value of Kp for the reaction Cl2 (g) \(\rightleftharpoons\) 2Cl(g) under the above conditions
is x \(\times\) 10-1.
The val...
INTEGER+4 / -12021
23Chemical Equilibrium
Value of KP for the equilibrium reactionN2O4(g) \(\rightleftharpoons\) 2NO2(g) at 288 K is 47.9. The KC for this reaction at same temperature is ____________. (Nearest integer)(R = 0.083 L bar K\(-\)1 mol\(-\)1)
INTEGER+4 / -12021
24Chemical Equilibrium
2SO2(g) + O2(g) \(\rightleftharpoons\) 2SO3(g)In an equilibrium mixture, the partial pressures are PSO3 = 43 kPa; PO2 = 530 Pa and PSO2 = 45 kPa. The equilibrium constant KP = ___________ \(\times\) 10\(-\)2. (Nearest integer)
INTEGER+4 / -12021
25Chemical Equilibrium
The gas phase reaction \(2A(g) \rightleftharpoons {A_2}(g)\) at 400 K has \(\Delta\)Go = + 25.2 kJ mol-1.The equilibrium constant KC for this reaction is ________ \(\times\) 10\(-\)2. (Round off to the Nearest Integer).[Use : R = 8.3 J mol$...
INTEGER+4 / -12021
26Chemical Equilibrium
0.01 moles of a weak acid HA (Ka = 2.0 \(\times\) 10\(-\)6) is dissolved in 1.0 L of 0.1 M HCl solution. The degree of dissociation of HA is __________ \(\times\) 10\(-\)5 (Round off to the Nearest Integer). [Neglect volume change on adding...
INTEGER+4 / -12021
27Chemical Equilibrium
Consider the reaction \(N_{2}O_{4}\left( g\right) \rightleftharpoons 2NO_{2}\left( g\right)\)The temperature at which KC = 20.4 and KP = 600.1, is ____________ K. (Round off to the Nearest Integer). [Assume all gases are ideal and R = 0...
INTEGER+4 / -12021
28Chemical Equilibrium
For the reaction \(A(g) \rightleftharpoons B(g)\) at 495 K, \(\Delta\)rG\(^\circ\) = \(-\)9.478 kJ mol\(-\)1.If we start the reaction in a closed container at 495 K with 22 millimoles of A, the amount of B in the equilibrium mixture is ____...
INTEGER+4 / -12021
29Chemical Equilibrium
In the figure shown below reactant A
(represented by square) is in equilibrium with
product B (represented by circle). The
equilibrium constant is :
(represented by square) is in equilibrium with
product B (represented by circle). The
equilibrium constant is :
MCQ+4 / -12020
30Chemical Equilibrium
The variation of equilibrium constant with
temperature is given below :
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overflo...
temperature is given below :
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overflo...
MCQ+4 / -12020
31Chemical Equilibrium
For the reaction
Fe2N(s) + \({3 \over 2}\)H2(g) ⇌ 2Fe(s) + NH3(g)
Fe2N(s) + \({3 \over 2}\)H2(g) ⇌ 2Fe(s) + NH3(g)
MCQ+4 / -12020
32Chemical Equilibrium
The value of KC is 64 at 800 K for the reaction
N2(g) + 3H2(g) ⇌ 2NH3(g)
The value of KC for the following reaction is :
NH3(g) ⇌ \({1 \over 2}\)N2(g) + \({3 \over 2}\)H2(g)
N2(g) + 3H2(g) ⇌ 2NH3(g)
The value of KC for the following reaction is :
NH3(g) ⇌ \({1 \over 2}\)N2(g) + \({3 \over 2}\)H2(g)
MCQ+4 / -12020
33Chemical Equilibrium
Consider the following reaction:
N2O4(g) ⇌ 2NO2(g); \(\Delta\)Ho = +58 kJ
For each of the following cases (a, b), the direction in which the equilibrium shifts is :
(a) Temperature is decreased.
(b) Pressure is increased by adding N2
at c...
N2O4(g) ⇌ 2NO2(g); \(\Delta\)Ho = +58 kJ
For each of the following cases (a, b), the direction in which the equilibrium shifts is :
(a) Temperature is decreased.
(b) Pressure is increased by adding N2
at c...
MCQ+4 / -12020
34Chemical Equilibrium
For a reaction X + Y ⇌ 2Z , 1.0 mol of X, 1.5 mol of Y and 0.5 mol of Z were taken in a 1 L
vessel and allowed to react. At equilibrium, the concentration of Z was 1.0 mol L–1. The equilibrium constant of reaction is \({x \over {15}}\). The...
vessel and allowed to react. At equilibrium, the concentration of Z was 1.0 mol L–1. The equilibrium constant of reaction is \({x \over {15}}\). The...
INTEGER+4 / -02020
35Chemical Equilibrium
For the equilibrium A ⇌ B , the variation of the
rate of the forward (a) and reverse (b) reaction
with time is given by :
rate of the forward (a) and reverse (b) reaction
with time is given by :
MCQ+4 / -12020
36Chemical Equilibrium
If the equilibrium constant for A ⇌ B + C is \(K_{eq}^{(1)}\) and that of
B + C ⇌ P is \(K_{eq}^{(2)}\), the equilibrium
constant for A ⇌ P is :
B + C ⇌ P is \(K_{eq}^{(2)}\), the equilibrium
constant for A ⇌ P is :
MCQ+4 / -12020
37Chemical Equilibrium
An open beaker of water in equilibrium with
water vapour is in a sealed container. When a
few grams of glucose are added to the beaker
of water, the rate at which water molecules :
water vapour is in a sealed container. When a
few grams of glucose are added to the beaker
of water, the rate at which water molecules :
MCQ+4 / -12020
38Chemical Equilibrium
Consider the following reversible chemical reactions :
The relation between K1 and K2 is :
The relation between K1 and K2 is :
MCQ+4 / -12019
39Chemical Equilibrium
For the following reactions, equilibrium
constants are given :
S(s) + O2(g) ⇋ SO2(g); K1 = 1052
2S(s) + 3O2(g) ⇋ 2SO3(g); K2 = 10129
The equilibrium constant for the reaction,
2SO2(g) + O2(g) ⇋ 2SO3(g) is :
constants are given :
S(s) + O2(g) ⇋ SO2(g); K1 = 1052
2S(s) + 3O2(g) ⇋ 2SO3(g); K2 = 10129
The equilibrium constant for the reaction,
2SO2(g) + O2(g) ⇋ 2SO3(g) is :
MCQ+4 / -12019
40Chemical Equilibrium
In a chemical reaction,
the initial concentration of B was 1.5 times of the
concentration of A, but the equilibrium concentrations of A and B were found to be equal. The equilibrium constant (K) for the aforesaid chemical reaction is -
the initial concentration of B was 1.5 times of the
concentration of A, but the equilibrium concentrations of A and B were found to be equal. The equilibrium constant (K) for the aforesaid chemical reaction is -
MCQ+4 / -12019
41Chemical Equilibrium
Two solids dissociate as follows –
The total pressure when both the solids dissociated simultaneously is -
The total pressure when both the solids dissociated simultaneously is -
MCQ+4 / -12019
42Chemical Equilibrium
The INCORRECT match in the following is :
MCQ+4 / -12019
43Chemical Equilibrium
In which one of the following equilibria, Kp \(\ne\) KC ?
MCQ+4 / -12019
44Chemical Equilibrium
Consider the reaction
N2(g) + 3H2(g) \(\rightleftharpoons\) 2NH3(g)
The equilibrium constant of the above reaction is Kp. If pure ammonia is left to dissociate, the partial pressure of ammonia at equilibrium is given by (Assume that PNH3 ...
N2(g) + 3H2(g) \(\rightleftharpoons\) 2NH3(g)
The equilibrium constant of the above reaction is Kp. If pure ammonia is left to dissociate, the partial pressure of ammonia at equilibrium is given by (Assume that PNH3 ...
MCQ+4 / -12019
45Chemical Equilibrium
The values of Kp/Kc for the following reactions at 300 K are, respectively : (At 300 K, RT = 24.62 dm3 atm mol–1)
N2(g) + O2(g) \(\rightleftharpoons\) 2 NO(g)
N2O4(g) \(\rightleftharpoons\) 2 NO(g)
N2(g) + 3H2(g) $$\rightleftharpoons$...
N2(g) + O2(g) \(\rightleftharpoons\) 2 NO(g)
N2O4(g) \(\rightleftharpoons\) 2 NO(g)
N2(g) + 3H2(g) $$\rightleftharpoons$...
MCQ+4 / -12019
46Chemical Equilibrium
5.1 g NH4SH is introduced in 3.0 L evacuated flask at 327ºC. 30% of the solid NH4SH decomposed to NH3 and H2S as gases . The Kp of the reaction at 327oC is (R = 0.082 L atm mol–1 K–1, Molar mass of S = 32 g mol–1 molar mass of N = 14 g mol–...
MCQ+4 / -12019
47Chemical Equilibrium
For the reaction,
2SO2(g) + O2(g) = 2SO3(g), \(\Delta\)H = –57.2 kJ mol–1
and KC = 1.7 × 1016
Which of the following statement is incorrect ?
2SO2(g) + O2(g) = 2SO3(g), \(\Delta\)H = –57.2 kJ mol–1
and KC = 1.7 × 1016
Which of the following statement is incorrect ?
MCQ+4 / -12019
48Chemical Equilibrium
The gas phase reaction 2NO2(g) \(\to\) N2O4(g) is an exothermic reaction. The decomposition of N2O4, in equilibrium mixture of NO2(g) and N2O4(g), can be increased by :
MCQ+4 / -12018
49Chemical Equilibrium
In which of the following reactions, an increase in the volume of the container will favour the formation of products?
MCQ+4 / -12018
50Chemical Equilibrium
At a certain temperature in a \(5\) \(L\) vessel, 2 moles of carbon monoxide and 3 moles of chlorine were allowed to reach equilibrium according to the reaction,
CO + Cl2 \(\rightleftharpoons\) COCl2
At equilibrium, if one mole o...
CO + Cl2 \(\rightleftharpoons\) COCl2
At equilibrium, if one mole o...
MCQ+4 / -12018