Chemical Equilibrium · Chemistry · JEE Main

Start Practice

MCQ (Single Correct Answer)

JEE Main 2024 (Online) 8th April Morning Shift
For the given hypothetical reactions, the equilibrium constants are as follows : $$\begin{aligned} & \mathrm{X} \rightleftharpoons \mathrm{Y} ; \mathr...
JEE Main 2024 (Online) 6th April Evening Shift
The ratio $$\frac{K_P}{K_C}$$ for the reaction : $$\mathrm{CO}_{(\mathrm{g})}+\frac{1}{2} \mathrm{O}_{2(\mathrm{~g})} \rightleftharpoons \mathrm{CO}_...
JEE Main 2024 (Online) 6th April Morning Shift
At $$-20^{\circ} \mathrm{C}$$ and $$1 \mathrm{~atm}$$ pressure, a cylinder is filled with equal number of $$\mathrm{H}_2, \mathrm{I}_2$$ and $$\mathrm...
JEE Main 2024 (Online) 5th April Evening Shift
Given below are two statements : Statement I : On passing $$\mathrm{HCl}_{(\mathrm{g})}$$ through a saturated solution of $$\mathrm{BaCl}_2$$, at room...
JEE Main 2024 (Online) 5th April Morning Shift
The following reaction occurs in the Blast furnance where iron ore is reduced to iron metal $$\mathrm{Fe}_2 \mathrm{O}_{3(s)}+3 \mathrm{CO}_{(g)} \rig...
JEE Main 2024 (Online) 4th April Evening Shift
The equilibrium constant for the reaction $$\mathrm{SO}_3(\mathrm{~g}) \rightleftharpoons \mathrm{SO}_2(\mathrm{~g})+\frac{1}{2} \mathrm{O}_2(\mathrm{...
JEE Main 2024 (Online) 31st January Evening Shift
$$\mathrm{A}_{(\mathrm{g})} \rightleftharpoons \mathrm{B}_{(\mathrm{g})}+\frac{\mathrm{C}}{2}(\mathrm{g})$$ The correct relationship between $$\mathrm...
JEE Main 2024 (Online) 31st January Morning Shift
For the given reaction, choose the correct expression of $$\mathrm{K}_{\mathrm{C}}$$ from the following :- $$\mathrm{Fe}_{(\mathrm{aq})}^{3+}+\mathrm{...
JEE Main 2023 (Online) 6th April Morning Shift
For a concentrated solution of a weak electrolyte ($$\mathrm{K}_{\text {eq }}=$$ equilibrium constant) $$\mathrm{A}_{2} \mathrm{B}_{3}$$ of concentra...
JEE Main 2022 (Online) 30th June Morning Shift
The equilibrium constant for the reversible reaction 2A(g) $$\rightleftharpoons$$ 2B(g) + C(g) is K1 $${3 \over 2}$$A(g) $$\rightleftharpoons$$ $${3 \...
JEE Main 2022 (Online) 29th June Evening Shift
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. ...
JEE Main 2022 (Online) 24th June Morning Shift
For a reaction at equilibrium A(g) $$\rightleftharpoons$$ B(g) + $${1 \over 2}$$ C(g) the relation between dissociation constant (K), degree of dissoc...
JEE Main 2020 (Online) 6th September Evening Slot
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)...
JEE Main 2020 (Online) 6th September Morning Slot
For the reaction Fe2N(s) + $${3 \over 2}$$H2(g) ⇌ 2Fe(s) + NH3(g)
JEE Main 2020 (Online) 6th September Morning Slot
The variation of equilibrium constant with temperature is given below : .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;b...
JEE Main 2020 (Online) 5th September Morning Slot
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 equilibr...
JEE Main 2020 (Online) 4th September Evening Slot
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 :...
JEE Main 2020 (Online) 4th September Morning Slot
For the equilibrium A ⇌ B , the variation of the rate of the forward (a) and reverse (b) reaction with time is given by :
JEE Main 2020 (Online) 2nd September Morning Slot
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 r...
JEE Main 2020 (Online) 9th January Evening Slot
In the figure shown below reactant A (represented by square) is in equilibrium with product B (represented by circle). The equilibrium constant is : ...
JEE Main 2019 (Online) 12th April Evening Slot
The INCORRECT match in the following is :
JEE Main 2019 (Online) 12th April Evening Slot
In which one of the following equilibria, Kp $$ \ne $$ KC ?
JEE Main 2019 (Online) 10th April Evening Slot
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 ? ...
JEE Main 2019 (Online) 8th April Evening Slot
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 equilibriu...
JEE Main 2019 (Online) 12th January Morning Slot
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 f...
JEE Main 2019 (Online) 12th January Morning Slot
Two solids dissociate as follows – The total pressure when both the solids dissociated simultaneously is - ...
JEE Main 2019 (Online) 11th January Morning Slot
Consider the reaction N2(g) + 3H2(g) $$\rightleftharpoons$$ 2NH3(g) The equilibrium constant of the above reaction is Kp. If pure ammonia is lef...
JEE Main 2019 (Online) 10th January Evening Slot
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 327...
JEE Main 2019 (Online) 10th January Morning Slot
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)  $$\rightle...
JEE Main 2019 (Online) 9th January Evening Slot
Consider the following reversible chemical reactions : The relation between K1 and K2 is : ...
JEE Main 2018 (Online) 16th April Morning Slot
The gas phase reaction 2NO2(g) $$ \to $$ N2O4(g) is an exothermic reaction. The decomposition of N2O4, in equilibrium mixture of NO2(g) and N2O4(g),...
JEE Main 2018 (Online) 15th April Evening Slot
At a certain temperature in a $$5$$ $$L$$ vessel, 2 moles of carbon monoxide and 3 moles of chlorine were allowed to reach equilibrium according to th...
JEE Main 2018 (Online) 15th April Morning Slot
In which of the following reactions, an increase in the volume of the container will favour the formation of products?
JEE Main 2017 (Online) 9th April Morning Slot
The following reaction occurs in the Blast Furnace where iron ore is reduced to iron metal : Fe2O3(s) + 3 CO(g) $$\rightleftharpoons$$ 2 Fe(1) + 3 CO2...
JEE Main 2016 (Online) 10th April Morning Slot
A solid XY kept in an evacuated sealed container undergoes decomposition to form a mixture of gases X and Y at temperature T. The equilibrium pressure...
JEE Main 2016 (Offline)
The equilibrium constant at 298 K for a reaction A + B $$\leftrightharpoons$$ C + D is 100. If the initial concentration of all the four species were ...
JEE Main 2015 (Offline)
The standard Gibbs energy change at 300 K for the reaction 2A $$\leftrightharpoons$$ B + C is 2494.2 J. At a given time, the composition of the reacti...
JEE Main 2014 (Offline)
For the reaction SO2 (g) + $${1 \over 2} O_2(g) \leftrightharpoons$$ SO3(g). if KP = KC(RT)x where the symbols have usual meaning then the value of ...
AIEEE 2012
The equilibrium constant (KC) for the reaction N2(g) + O2(g) $$\to$$ 2NO(g) at temperature T is 4 $$\times$$ 10–4. The value of KC for the reaction, N...
AIEEE 2011
A vessel at 1000 K contains CO2 with a pressure of 0.5 atm. Some of the CO2 is converted into CO on the addition of graphite. If the total pressure at...
AIEEE 2010
In aqueous solution the ionization constants for carbonic acid are K1 = 4.2 x 10–7 and K2 = 4.8 x 10–11 Select the correct statement for a saturated 0...
AIEEE 2008
The equilibrium constants KP1 and KP2 for the reactions X $$\leftrightharpoons$$ 2Y and Z $$\leftrightharpoons$$ P + Q, respectively are in the ratio...
AIEEE 2008
For the following three reactions a, b and c, equilibrium constants are given: a. CO (g) + H2O (g) $$\leftrightharpoons$$ CO2(g) + H2 (g) ; K1 b. CH4...
AIEEE 2006
Phosphorus pentachloride dissociates as follows, in a closed reaction vessel PCl5 (g) $$\leftrightharpoons$$ PCl3 (g) + Cl2 (g) If total pressure at ...
AIEEE 2006
The equilibrium constant for the reaction SO3 (g) $$\leftrightharpoons$$ SO2 (g) + $$1 \over 2$$ O2 (g) is Kc = 4.9 $$\times$$ 10–2. The value of Kc...
AIEEE 2005
The exothermic formation of ClF3 is represented by the equation: Cl2 (g) + 3F2 (g) $$\leftrightharpoons$$ 2ClF3 (g); $$\Delta H$$ = -329 kJ Which of ...
AIEEE 2005
For the reaction 2NO2 (g) $$\leftrightharpoons$$ 2NO (g) + O2 (g), (Kc = 1.8 $$\times$$ 10-6 at 184oC) (R = 0.0831 kJ/(mol. K)) When Kp and Kc are com...
AIEEE 2005
An amount of solid NH4HS is placed in a flask already containing ammonia gas at a certain temperature and 0.50 atm. Pressure. Ammonium hydrogen sulphi...
AIEEE 2004
What is the equilibrium expression for the reaction P4 (s) + 5O2 $$\leftrightharpoons$$ P4O10 (s)?
AIEEE 2004
For the reaction, CO(g) + Cl2(g) $$\leftrightharpoons$$ COCl2(g) the $${{{K_p}} \over {{K_c}}}$$ is equal to :
AIEEE 2004
The equilibrium constant for the reaction N2(g) + O2(g) $$\leftrightharpoons$$ 2NO(g) at temperature T is 4 $$\times$$ 10-4. The value of Kc for the r...
AIEEE 2003
Consider the reaction equilibrium 2 SO2 (g) + O2 (g) $$\leftrightharpoons$$ 2 SO3 (g); $$\Delta H^o$$ = -198 kJ One the basis of Le Chatelier's princi...
AIEEE 2003
For the reaction equilibrium N2O4 (g) $$\leftrightharpoons$$ 2NO2 (g) the concentrations of N2O4 and NO2 at equilibrium are 4.8 $$\times$$ 10-2 and 1...
AIEEE 2002
Change in volume of the system does not alter which of the following equilibria?
AIEEE 2002
For the reaction CO (g) + (1/2) O2 (g) $$\leftrightharpoons$$ CO2 (g), Kp/Kc is :

Numerical

JEE Main 2024 (Online) 29th January Evening Shift
The following concentrations were observed at $$500 \mathrm{~K}$$ for the formation of $$\mathrm{NH}_3$$ from $$\mathrm{N}_2$$ and $$\mathrm{H}_2$$. A...
JEE Main 2024 (Online) 29th January Morning Shift
For the reaction $$\mathrm{N}_2 \mathrm{O}_{4(\mathrm{~g})} \rightleftarrows 2 \mathrm{NO}_{2(\mathrm{~g})}, \mathrm{K}_{\mathrm{p}}=0.492 \mathrm{~at...
JEE Main 2023 (Online) 11th April Evening Shift
4.5 moles each of hydrogen and iodine is heated in a sealed ten litre vessel. At equilibrium, 3 moles of $$\mathrm{HI}$$ were found. The equilibrium c...
JEE Main 2023 (Online) 11th April Morning Shift
A mixture of 1 mole of $$\mathrm{H}_{2} \mathrm{O}$$ and 1 mole of $$\mathrm{CO}$$ is taken in a 10 litre container and heated to $$725 \mathrm{~K}$$....
JEE Main 2023 (Online) 10th April Evening Shift
$$\mathrm{A}(g) \rightleftharpoons 2 \mathrm{~B}(g)+\mathrm{C}(g)$$ For the given reaction, if the initial pressure is $$450 \mathrm{~mm} ~\mathrm{Hg}...
JEE Main 2023 (Online) 10th April Morning Shift
The number of correct statement/s involving equilibria in physical processes from the following is ________ (A) Equilibrium is possible only in a clos...
JEE Main 2023 (Online) 6th April Evening Shift
The equilibrium composition for the reaction $$\mathrm{PCl}_{3}+\mathrm{Cl}_{2} \rightleftharpoons \mathrm{PCl}_{5}$$ at $$298 \mathrm{~K}$$ is given ...
JEE Main 2023 (Online) 1st February Morning Shift
(i) $$\mathrm{X}(\mathrm{g}) \rightleftharpoons \mathrm{Y}(\mathrm{g})+\mathrm{Z}(\mathrm{g}) \quad \mathrm{K}_{\mathrm{p} 1}=3$$ (ii) $$\mathrm{A}(\m...
JEE Main 2023 (Online) 31st January Morning Shift
For reaction : $$\mathrm{SO}_{2}(\mathrm{~g})+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons \mathrm{SO}_{3}(\mathrm{~g})$$ $$\mathrm{K}_{...
JEE Main 2023 (Online) 30th January Evening Shift
Consider the following equation: $2 \mathrm{SO}_{2}(g)+\mathrm{O}_{2}(g) \rightleftharpoons 2 \mathrm{SO}_{3}(g), \Delta H=-190 \mathrm{~kJ}$ The n...
JEE Main 2023 (Online) 29th January Evening Shift
At 298 K $$\mathrm{N_2~(g)+3H_2~(g)\rightleftharpoons~2NH_3~(g),~K_1=4\times10^5}$$ $$\mathrm{N_2~(g)+O_2~(g)\rightleftharpoons~2NO~(g),~K_2=1.6\times...
JEE Main 2023 (Online) 29th January Morning Shift
Water decomposes at 2300 K $$\mathrm{H_2O(g)\to H_2(g)+\frac{1}{2}O_2(g)}$$ The percent of water decomposing at 2300 K and 1 bar is ___________ (Neare...
JEE Main 2023 (Online) 29th January Morning Shift
Consider the following reaction approaching equilibrium at 27$$^\circ$$C and 1 atm pressure $$\mathrm{A+B}$$ $$\mathrel{\mathop{\kern0pt\rightleftharp...
JEE Main 2022 (Online) 28th July Evening Shift
At $$600 \mathrm{~K}, 2 \mathrm{~mol}$$ of $$\mathrm{NO}$$ are mixed with $$1 \mathrm{~mol}$$ of $$\mathrm{O}_{2}$$. $$2 \mathrm{NO}_{(\mathrm{g})}+\m...
JEE Main 2022 (Online) 26th July Morning Shift
At $$298 \mathrm{~K}$$, the equilibrium constant is $$2 \times 10^{15}$$ for the reaction : $$\mathrm{Cu}(\mathrm{s})+2 \mathrm{Ag}^{+}(\mathrm{aq}) \...
JEE Main 2022 (Online) 29th June Evening Shift
A box contains 0.90 g of liquid water in equilibrium with water vapour at 27$$^\circ$$C. The equilibrium vapour pressure of water at 27$$^\circ$$C is ...
JEE Main 2022 (Online) 27th June Morning Shift
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 ...
JEE Main 2022 (Online) 26th June Evening Shift
40% of HI undergoes decomposition to H2 and I2 at 300 K. $$\Delta$$G$$^\Theta $$ for this decomposition reaction at one atmosphere pressure is _______...
JEE Main 2022 (Online) 25th June Morning Shift
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$$-$...
JEE Main 2022 (Online) 24th June Evening Shift
PCl5 dissociates as PCl5(g) $$\rightleftharpoons$$ PCl3(g) + Cl2(g) 5 moles of PCl5 are placed in a 200 litre vessel which contains 2 moles of N2 and ...
JEE Main 2022 (Online) 24th June Morning Shift
2O3(g) $$\rightleftharpoons$$ 3O2(g) At 300 K, ozone is fifty percent dissociated. The standard free energy change at this temperature and 1 atm press...
JEE Main 2021 (Online) 27th August Evening Shift
When 5.1 g of solid NH4HS is introduced into a two litre evacuated flask at 27$$^\circ$$C, 20% of the solid decomposes into gaseous ammonia and hydrog...
JEE Main 2021 (Online) 27th August Morning Shift
The number of moles of NH3, that must be added to 2L of 0.80 M AgNO3 in order to reduce the concentration of Ag+ ions to 5.0 $$\times$$ 10$$-$$8 M (Kf...
JEE Main 2021 (Online) 26th August Evening Shift
The equilibrium constant Kc at 298 K for the reaction A + B $$\rightleftharpoons$$ C + D is 100. Starting with an equimolar solution with concentratio...
JEE Main 2021 (Online) 26th August Evening Shift
The reaction rate for the reaction[PtCl4]2$$-$$ + H2O $$\rightleftharpoons$$ [Pt(H2O)Cl3]$$-$$ + Cl$$-$$was measured as a function of concentrations o...
JEE Main 2021 (Online) 26th August Morning Shift
The OH$$-$$ concentration in a mixture of 5.0 mL of 0.0504 M NH4Cl and 2 mL of 0.0210 M NH3 solution is x $$\times$$ 10$$-$$6 M. The value of x is ___...
JEE Main 2021 (Online) 27th July Evening Shift
The equilibrium constant for the reactionA(s) $$\rightleftharpoons$$ M(s) + $${1 \over 2}$$O2(g)is Kp = 4. At equilibrium, the partial pressure of O2 ...
JEE Main 2021 (Online) 27th July Morning Shift
PCl5 $$\rightleftharpoons$$ PCl3 + Cl2Kc = 1.8443.0 moles of PCl5 is introduced in a 1 L closed reaction vessel at 380 K. The number of moles of PCl5 ...
JEE Main 2021 (Online) 25th July Evening Shift
Assuming that Ba(OH)2 is completely ionised in aqueous solution under the given conditions the concentration of H3O+ ions in 0.005 M aqueous solution ...
JEE Main 2021 (Online) 25th July Morning Shift
For the reactionA + B $$\rightleftharpoons$$ 2Cthe value of equilibrium constant is 100 at 298 K. If the initial concentration of all the three specie...
JEE Main 2021 (Online) 22th July Evening Shift
Value of KP for the equilibrium reactionN2O4(g) $$\rightleftharpoons$$ 2NO2(g) at 288 K is 47.9. The KC for this reaction at same temperature is _____...
JEE Main 2021 (Online) 20th July Morning Shift
2SO2(g) + O2(g) $$\rightleftharpoons$$ 2SO3(g)In an equilibrium mixture, the partial pressures are PSO3 = 43 kPa; PO2 = 530 Pa and PSO2 = 45 kPa. The ...
JEE Main 2021 (Online) 18th March Evening Shift
The gas phase reaction $$2A(g) \rightleftharpoons {A_2}(g)$$ at 400 K has $$\Delta$$Go = + 25.2 kJ mol-1.The equilibrium constant KC for this reaction...
JEE Main 2021 (Online) 17th March Evening Shift
Consider the reaction $$N_{2}O_{4}\left( g\right) \rightleftharpoons 2NO_{2}\left( g\right) $$The temperature at which KC = 20.4 and KP = 600.1, is...
JEE Main 2021 (Online) 17th March Morning Shift
0.01 moles of a weak acid HA (Ka = 2.0 $$\times$$ 10$$-$$6) is dissolved in 1.0 L of 0.1 M HCl solution. The degree of dissociation of HA is _________...
JEE Main 2021 (Online) 16th March Morning Shift
For the reaction $$A(g) \rightleftharpoons B(g)$$ at 495 K, $$\Delta$$rG$$^\circ$$ = $$-$$9.478 kJ mol$$-$$1.If we start the reaction in a closed cont...
JEE Main 2021 (Online) 26th February Morning Shift
A homogeneous ideal gaseous reaction $$A{B_{2(g)}} \rightleftharpoons {A_{(g)}} + 2{B_{(g)}}$$ is carried out in a 25 litre flask at 27$$^\circ$$C. Th...
JEE Main 2021 (Online) 24th February Morning Shift
The stepwise formation of $${\left[ {Cu{{\left( {N{H_3}} \right)}_4}} \right]^{2 + }}$$ is given below: The value of stability constants K1, K2, K3 a...
JEE Main 2021 (Online) 24th February Morning Shift
At 1990 K and 1 atm pressure, there are equal number of Cl2, molecules and Cl atoms in the reaction mixture. The value of Kp for the reaction Cl2 (g) ...
JEE Main 2021 (Online) 24th February Morning Shift
For the reaction A(g) $$ \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 re...
JEE Main 2020 (Online) 5th September Evening Slot
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 concentra...

MCQ (More than One Correct Answer)

JEE Main 2023 (Online) 1st February Evening Shift
The effect of addition of helium gas to the following reaction in equilibrium state, is : $$\mathrm{PCl}_{5}(\mathrm{g}) \rightleftharpoons \mathrm{PC...
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12