JEE Main PYQs — Chemical Equilibrium

Given below are two statements: Statement I: When a system containing ice in equilibrium with water (liquid) is heated, heat is absorbed by the system and there is no change in the temperature of the…

Consider the following chemical equilibrium of the gas phase reaction at a constant temperature: A(g) <=> B(g) + C(g) If p is the total pressure, Kp is the pressure equilibrium constant and is the…

At temperature T, compound AB2(g) dissociates as: AB2(g) <=> AB(g) + 12 B2(g) having degree of dissociation x (small compared to unity). The correct expression for x in terms of Kp and p is:

Consider the equilibrium CO(g) + 3H2(g) <=> CH4(g) + H2O(g) If the pressure applied over the system increases by two fold at constant temperature then: (A) Concentration of reactants and products…

Ice and water are placed in a closed container at a pressure of 1 atm and temperature 273.15 K. If pressure of the system is increased 2 times, keeping temperature constant, then identify correct…

The ratio KPKC for the reaction: CO(g) + 12O2(g) CO2(g) is:

The following reaction occurs in the Blast Furnace where iron ore is reduced to iron metal: Fe2O3(s) + 3CO(g) Fe(l) + 3CO2(g) Using Le Chatelier's principle, predict which one of the following will…

The equilibrium constant for the reaction SO3(g) SO2(g) + 12O2(g) is Kc = 4.9 10-2. The value of Kc for the reaction 2SO2(g) + O2(g) 2SO3(g) is:

For the given reaction, choose the correct expression of KC: Fe3+(aq) + SCN-(aq) (FeSCN)2+(aq)

The equilibrium Cr2O72- 2CrO42- is shifted to the right in:

For the given hypothetical reactions, the equilibrium constants are: X Y;\ K1 = 1.0 Y Z;\ K2 = 2.0 Z W;\ K3 = 4.0 The equilibrium constant for the reaction X W is

A(g) B(g) + C2(g). The correct relationship between KP, and equilibrium pressure P is

At -20 °C and 1 atm pressure, a cylinder is filled with equal number of H2, I2 and HI molecules for the reaction H2(g) + I2(g) 2HI(g). The Kp for the process is x 10-1. The value of x is ____ [R =…

The effect of addition of helium gas to the following reaction at constant volume in equilibrium state is: PCl5(g) PCl3(g) + Cl2(g)

For a concentrated solution of a weak electrolyte (Keq = equilibrium constant) A2B3 of concentration C, the degree of dissociation is

For a reaction at equilibrium A(g) B(g) + 12C(g), the relation between dissociation constant (K), degree of dissociation () and equilibrium pressure (p) is given by:

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…

If the equilibrium constant for A B + C is Keq(1) and that of B + C P is Keq(2), the equilibrium constant for A P is:

For the reaction Fe2N(s) + 32H2(g) 2Fe(s) + NH3(g)

Consider the reaction: N2O4(g) 2NO2(g), H0 = +58\ kJ For each case, the direction in which equilibrium shifts is: (a) Temperature is decreased. (b) Pressure is increased by adding N2 at constant T.

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:

For the following Assertion and Reason, the correct option is: Assertion (A): When Cu(II) and sulphide ions are mixed, they react together extremely quickly to give a solid. Reason (R): The…

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) 12N2(g) + 32H2(g)

In which one of the following equilibria, KP KC?

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:

For the reaction 2SO2(g) + O2(g) 2SO3(g), H = -57.2\ kJ\ mol-1 and Kc = 1.7 1016. Which of the following statements is incorrect?

What are the values of KpKc for the following reactions at 300 K respectively? (RT = 24.62\ dm3\ atm\ mol-1) (i) N2(g) + O2(g) 2NO(g) (ii) N2O4(g) 2NO2(g) (iii) N2(g) + 3H2(g) 2NH3(g)

In a chemical reaction A + 2B K 2C + D, 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…

Two solids dissociate as follows: A(s) B(g) + C(g);\ KP1 = x\ atm2 D(s) C(g) + E(g);\ KP2 = y\ atm2 The total pressure when both the solids dissociate simultaneously is:

Consider the reaction N2(g) + 3H2(g) 2NH3(g). The equilibrium constant is KP. If pure ammonia is left to dissociate, the partial pressure of ammonia at equilibrium is given by (Assume PNH3 Ptotal at…

5.1 g NH4SH is introduced in 3.0 L evacuated flask at 327 °C. 30% of the solid NH4SH decomposes to NH3 and H2S as gases. The KP of the reaction at 327 °C is (R = 0.082\ L\ atm\ mol-1\ K-1; Molar mass…