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Le Chatelier's principle: effect of concentration, pressure, temperature, inert gas

55 questions on Le Chatelier's principle: effect of concentration, pressure, temperature, inert gas from the Chemical Equilibrium chapter: 11 NEET level, 22 JEE Main, 22 JEE Advanced. Each one opens with its answer and solution.

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For N2(g) + 3H2(g) <=> 2NH3(g) at equilibrium, the pressure is increased at constant temperature by decreasing the volume. The equilibrium shifts NEET level
Chlorine gas is added at constant volume and temperature to the equilibrium PCl5(g) <=> PCl3(g) + Cl2(g). At the new equilibrium NEET level
The equilibrium H2(g) + I2(g) <=> 2HI(g) is established in a closed vessel. If the volume of the vessel is reduced at constant temperature, the amount of HI NEET level
More H2 is added at constant temperature to the equilibrium H2(g) + I2(g) <=> 2HI(g). What happens to the value of K_c? NEET level
The equilibrium mixture N2O4(g) <=> 2NO2(g) is compressed to a smaller volume at constant temperature. The equilibrium shifts NEET level
In a closed rigid vessel, 2SO2(g) + O2(g) <=> 2SO3(g) is at equilibrium. More SO2 is added at constant temperature. Compared with the original equilibrium, at t... JEE Main level
A mixture of N2, H2 and NH3 is at equilibrium: N2(g) + 3H2(g) <=> 2NH3(g). The volume is suddenly halved at constant temperature. Immediately afterwards, the re... JEE Main level
At equilibrium in a rigid vessel, [PCl5] = 0.20 M, [PCl3] = 0.10 M and [Cl2] = 0.10 M for PCl5(g) <=> PCl3(g) + Cl2(g). Then 0.10 mol/L of Cl2 is injected at co... JEE Main level
The equilibrium N2O4(g) <=> 2NO2(g) in a cylinder is compressed isothermally to half its volume and a new equilibrium is reached. Compared with the original equ... JEE Main level
Solid CaCO3 is in equilibrium with CaO and CO2 in a cylinder with a movable piston at constant temperature, with excess solid present. The volume is doubled and... JEE Main level
For A(g) + B(g) <=> C(g) + D(g), K_c = 6.0 at a given temperature. 1.0 M of A and 1.0 M of B are allowed to reach equilibrium in a rigid vessel. Then 1.0 M more... JEE Main level
At equilibrium in a rigid 2.0 L vessel, [PCl5] = 0.20 M, [PCl3] = 0.10 M and [Cl2] = 0.10 M for PCl5(g) <=> PCl3(g) + Cl2(g). Some Cl2 is then removed instantly... JEE Main level
In the equilibrium N2O4(g) <=> 2NO2(g) at constant temperature, the equilibrium partial pressures are p(N2O4) = 1.00 atm and p(NO2) = 0.60 atm. The volume is ha... JEE Main level
For the equilibrium N2(g) + 3H2(g) <=> 2NH3(g) at constant temperature, which of the following changes will shift the equilibrium in the forward direction (towa... JEE Main level
The equilibrium H2(g) + I2(g) <=> 2HI(g) is set up in a closed vessel at constant temperature, and the volume is then halved. Which statements are correct? JEE Main level
For PCl5(g) <=> PCl3(g) + Cl2(g) at constant temperature, which changes increase the degree of dissociation of PCl5 at the new equilibrium? JEE Main level
For 2SO2(g) + O2(g) <=> 2SO3(g), K_c = 40 L mol^-1 at a given temperature. An equilibrium mixture is disturbed by adding O2 at constant volume and temperature. ... JEE Advanced level
For N2O4(g) <=> 2NO2(g), K_p = 0.50 atm at a given temperature. Starting from pure N2O4, the degree of dissociation alpha at a total equilibrium pressure of 4.0... JEE Advanced level
For A(g) + B(g) <=> C(g) at constant temperature, an equilibrium mixture in a 10.0 L vessel contains 1.0 mol A, 2.0 mol B and 3.0 mol C. The vessel is then comp... JEE Advanced level
For N2(g) + 3H2(g) <=> 2NH3(g) at equilibrium in a rigid vessel, [N2] = 0.50 M, [H2] = 0.50 M and [NH3] = 0.25 M. Then enough N2 is added to make [N2] = 1.00 M ... JEE Advanced level
Methanol is made from the gas-phase equilibrium CO(g) + 2H2(g) <=> CH3OH(g) at constant temperature. If the total pressure of the equilibrium mixture is doubled... JEE Advanced level
1.0 mol of SO2Cl2(g) is heated in a 5.0 L vessel; at equilibrium 0.30 mol has dissociated, SO2Cl2(g) <=> SO2(g) + Cl2(g). The mixture is then transferred to a 2... JEE Advanced level
For A(g) + B(g) <=> 2C(g), K_c = 6.25 at constant temperature. 1.0 mol each of A and B are placed in a 1.0 L vessel and allowed to reach equilibrium. All of C i... JEE Advanced level
For C(s) + CO2(g) <=> 2CO(g) at a fixed temperature, the gas mixture at equilibrium under a total pressure of 1.0 atm contains 0.50 mole fraction of CO. The tot... JEE Advanced level
An equilibrium mixture of N2(g) + 3H2(g) <=> 2NH3(g) is compressed isothermally to half its volume and allowed to re-equilibrate. Which statements are correct? JEE Advanced level
Excess solid NH4Cl is in equilibrium with its gaseous products in a closed vessel at constant temperature: NH4Cl(s) <=> NH3(g) + HCl(g). The volume of the vesse... JEE Advanced level
For H2(g) + I2(g) <=> 2HI(g) at equilibrium in a rigid vessel, [H2] = [I2] = 0.050 M and [HI] = 0.400 M. Then 0.050 M of H2 is added at constant temperature. Wh... JEE Advanced level
For N2(g) + 3H2(g) <=> 2NH3(g), Delta H = -92 kJ. On raising the temperature of the equilibrium mixture, NEET level
An inert gas is added to the equilibrium N2(g) + 3H2(g) <=> 2NH3(g) at constant temperature and constant volume. The equilibrium NEET level
An inert gas is added at constant temperature and constant pressure to PCl5(g) <=> PCl3(g) + Cl2(g) at equilibrium. The equilibrium NEET level
For an endothermic reaction at equilibrium, the temperature is increased. The value of the equilibrium constant NEET level
A sealed tube holds the equilibrium N2O4(g) <=> 2NO2(g) with Delta H = +57 kJ (N2O4 is colourless, NO2 is brown). When the tube is heated, the colour NEET level
At constant temperature and pressure, an inert gas is added to H2(g) + I2(g) <=> 2HI(g) at equilibrium. The position of equilibrium NEET level
For N2(g) + 3H2(g) <=> 2NH3(g), Delta H = -92 kJ. The temperature of the equilibrium mixture in a rigid vessel is raised. Which statement is correct? JEE Main level
At constant T and constant volume, argon is added to the equilibrium 2SO2(g) + O2(g) <=> 2SO3(g). Which is correct? JEE Main level
Argon is added to N2O4(g) <=> 2NO2(g) at equilibrium while temperature and total pressure are kept constant. Which pair of changes occurs? JEE Main level
For a reaction A + B <=> C + D the equilibrium constant is 4 at 300 K and 9 at 400 K. The reaction is JEE Main level
The equilibrium constant of a gas-phase reaction is 0.020 at 400 K and 0.090 at 450 K. Taking R = 8.314 J mol^-1 K^-1 and Delta H independent of temperature, fi... JEE Main level
One mole of PCl5 and 3.0 mol of an inert gas are kept at a constant total pressure of 1.0 atm and a temperature at which K_p = 0.50 atm for PCl5(g) <=> PCl3(g) ... JEE Main level
For N2O4(g) <=> 2NO2(g), Delta H = +57.2 kJ/mol (assume constant) and K_p = 0.15 at 298 K. Taking R = 8.314 J mol^-1 K^-1, find K_p at 350 K to the nearest inte... JEE Main level
For a reaction, Delta H = +98.0 kJ/mol and Delta S = +240 J mol^-1 K^-1 (both assumed independent of temperature). At what temperature (in K, nearest integer) d... JEE Main level
The equilibrium N2(g) + 3H2(g) <=> 2NH3(g) (Delta H<0) in a closed rigid vessel is heated to a higher temperature and allowed to re-equilibrate. Select the corr... JEE Main level
Inert gas (He) is added to gaseous equilibria. Select the correct statements. JEE Main level
For the decomposition CaCO3(s) <=> CaO(s) + CO2(g), Delta H>0, carried out in a closed vessel with excess solids present, select the correct statements. JEE Main level
The equilibrium 2NO2(g) <=> N2O4(g) is exothermic in the forward direction. A rigid sealed flask containing the equilibrium mixture is heated from 300 K to 350 ... JEE Advanced level
One mole of N2O4 is 20\% dissociated in the equilibrium N2O4(g) <=> 2NO2(g). Without changing temperature or total pressure, 2.0 mol of argon is quickly added s... JEE Advanced level
For a gaseous equilibrium, K = 0.10 at 300 K and K = 0.80 at 400 K. Using R = 8.314 J mol^-1 K^-1 and assuming Delta H deg constant, Delta H deg in kJ/mol is ab... JEE Advanced level
N2O4(g) <=> 2NO2(g) is 20\% dissociated at 300 K and 1.0 atm. On heating to 320 K at the same total pressure, K_p doubles. The new degree of dissociation is JEE Advanced level
For the ammonia synthesis equilibrium N2(g) + 3H2(g) <=> 2NH3(g) (Delta H<0), consider: (i) raising the temperature at constant pressure; (ii) adding helium at ... JEE Advanced level
At a total pressure of 1.0 atm, N2O4(g) is 20\% dissociated at 300 K and 50\% dissociated at 350 K (equilibrium N2O4(g) <=> 2NO2(g)). Assuming Delta H is consta... JEE Advanced level
One mole of N2O4 is kept at a constant total pressure of 1.0 atm and constant temperature where K_p = 0.50 atm for N2O4(g) <=> 2NO2(g). How many moles of an ine... JEE Advanced level
For N2(g) + 3H2(g) <=> 2NH3(g), Delta H deg = -92.0 kJ/mol (assume constant) and K = 6.0 x 10^5 at 298 K. Taking R = 8.314 J mol^-1 K^-1, find the temperature i... JEE Advanced level
For an exothermic reaction, E_a(forward) = 60 kJ/mol and Delta H = -40 kJ/mol. Select the correct statements. JEE Advanced level
At constant T and P, inert gas is added until the total gas volume doubles (before any shift takes place). For which equilibria is the value of Q_p/K_p immediat... JEE Advanced level
A reaction has Delta H deg = +60 kJ/mol and Delta S deg = +150 J mol^-1 K^-1, both independent of temperature (R = 8.314 J mol^-1 K^-1). Select the correct stat... JEE Advanced level