Chemical Equilibrium Questions

What is wrong about equilibrium state –

For an exothermic reaction in which the number of moles of reactants are more than the number of moles of products. In order to displace the reaction in the reverse direction, what are the favourable conditions .

For the reaction : PCl₃(g) + Cl₂(g) ⇌ PCl₅(g) at 250°C the Value of Kc is 26, then the value of Kp at the same temp. will be –

The correct expression for equilibrium constant, Kc, for the reaction : H₂(g) + 1/2 O₂(g) ⇌ H₂O(g) is –

The value of equilibrium constant for a reaction depends on-

For the reaction H₂(g) + I₂(g) ⇌ 2HI(g) at 721 K, the value of equilibrium constant Kc is 50. When the equilibrium concentration of both H₂ & I₂ is 0.5 M, value of Kp under the same conditions will be –

The value of Δng for the reaction : 2Hg(l) + Cl₂(g) ⇌ Hg₂Cl₂(s) is –

For the equilibrium reaction : 2HCl(g) ⇌ H₂(g) + Cl₂(g) the equilibrium constant is 1.0 × 10⁻⁵ what is the concentration of HCl if the equilibrium concentrations of H₂ and Cl₂ are 1.2 × 10⁻³ M and 1.2 × 10⁻⁴ M respectively –

Kp will be equal to Kc under which of the following conditions for the reaction– aA + bB ⇌ cC + dD

The statement not applicable to an irreversible reaction is –

In a 10 litre box 2.5 mole hydroiodic acid is taken. After equilibrium 2HI ⇌ H₂ + I₂ the concentration of HI is found to be 0.1 mol l⁻¹. The concentration of [H₂] at equilibrium in mol l⁻¹, is –

In the following reactions – (a) 2N₂O₅(g) ⇌ 4NO₂(g) + O₂(g) (b) 4NO₂(g) + O₂(g) ⇌ 2N₂O₅(g) Choose the correct fact –

The relation between Kp and Kc for the reaction A + B ⇌ C + 2D is –

The equilibrium constant for the reaction 2X(g) + Y(g) ⇌ 2Z(g) is 2.25. What would be the concentration of Y at equilibrium with 2.0 moles of X and 3.0 moles of Z in one litre vessel at equilibrium –

The reversible reaction [Cu(NH₃)₄]²⁺ + SO₃²⁻ ⇌ [Cu(NH₃)₃SO₃] + NH₃ is at equilibrium. What would not happen if ammonia is added –

The equilibrium constants for the reaction X₂ ⇌ 2X at 300K and 600K are 10⁻⁸ and 10⁻³ respectively. The reaction is –

The equilibrium constant of the reaction A + B ⇌ C + D is 10. If rate constant of forward reaction is 203, the rate constant of backward reaction is –

In closed vessel PCl₅ undergoes thermal dissociation as – PCl₅ ⇌ PCl₃ + Cl₂, the mole fraction of PCl₃ at equilibrium is 0.4. The total pressure is 2.0 atmosphere. The partial pressure of Cl₂ at equilibrium is –

The Kc for the reaction A + B ⇌ C + D is 9. If one mole of each of A and B are initially mixed and there is no change in volume, the number of moles of C formed is –

At a total pressure of 2 atmospheres, the number of moles of N₂, H₂ and NH₃ at equilibrium in a gaseous mixture are 1, 3 and 2. The partial pressure of NH₃ in atmospheres is –

During thermal dissociation of gas, the vapour density -

When a reversible reaction has reached the state of equilibrium -

According to Le Chatelier principle, an increase in the temperature of the following reaction will N₂ + O₂ ⇌ 2NO − 43200 cal

Which of the following equilibrium is not affected by pressure -

Which of the following will shift the reaction PCl₃(g) + Cl₂(g) ⇌ PCl₅(g) to the left side-

In what manner will increase of pressure affect the equation C(s) + H₂O(g) ⇌ CO(g) + H₂(g) -

Which of the following reaction will be favoured at low pressure -

For the reaction PCl₅(g) ⇌ PCl₃(g) + Cl₂(g), the forward reaction at constant temperature is favoured by -

When H₂ is added to an equilibrium mixture 2HI(g) ⇌ H₂(g) + I₂(g), at constant temperature, the-

Which among the following conditions, increases the yield of the product in the equilibrium, 3A(g) + B(g) ⇌ 4C(g) + heat

The role of catalyst in reversible reaction is-

In the reaction A(g) + B(g) ⇌ C(g), the backward reaction is favoured by -

Factors affecting Kc is/are -

The reaction in which the yield of the products can not be increased by the application of high pressure is –

In the reaction N₂(g) + 3H₂(g) ⇌ 2NH₃(g), the forward reaction is exothermic and the backward reaction is endothermic. In order to produce more heat it is necessary –

Adding inert gas to system N₂(g) + 3H₂(g) ⇌ 2NH₃(g) at equilibrium at constant volume will be –

Dissociation of phosphorus pentachloride is favoured by –

On adding inert gas to the equilibrium PCl₅(g) ⇌ PCl₃(g) + Cl₂(g) at constant pressure. The degree of dissociation will remain –

In the reaction, 2SO₂(g) + O₂(g) ⇌ 2SO₃(g) + X cals, most favourable condition of temperature and pressure for greater yield of SO₃ are -

In the melting of ice, which one of the conditions will be more favourable –

Consider the reaction, CaCO₃(s) ⇌ CaO(s) + CO₂(g); in closed container at equilibrium. What would be the effect of addition of CaCO₃ on the equilibrium concentration of CO₂ -

At 250°C and 1 atmospheric pressure, the vapour density of equilibrium mixture obtained on dissociation of PCl₅ is 57.9. What will be the degree of dissociation of PCl₅ –

N₂O₄ dissociates as N₂O₄(g) ⇌ 2NO₂(g) at 273 K and 2 atm pressure. The equilibrium mixture has a vapour density of 41. What will be the degree of dissociation -

An unknown compound A dissociates at 500°C to give products as follows - A(g) ⇌ B(g) + C(g) + D(g) Vapour density of the equilibrium mixture is 50 when it dissociates to the extent to 10%. What will be the molecular weight of Compound A –

In Which of the following equilibria, the value of Kₚ is less than Kc -

Kₚ/Kc for the gaseous reaction – (a) 2 A + 3 B ⇌ 2C (b) 2 A ⇌ 4B (c) A + B + 2C ⇌ 4D would be respectively -

The unit of equilibrium constant for the reaction H₂ + I₂ ⇌ 2HI is –

For the reaction C(s) + CO₂(g) ⇌ 2CO(g) the partial pressure of CO₂ and CO are 2.0 and 4.0 atm respectively at equilibrium. The Kₚ for the reaction is –

The equilibrium constant for the reaction Zn(s)+CO₂(g) ⇌ ZnO(s) + CO(g) is -

In the reaction C₂H₄(g) + H₂(g) ⇌ C₂H₆(g), the equilibrium constant can be expressed in units of -