NDA Chemical Equilibrium

For the reaction: N₂(g) + 3H₂(g) ⇌ 2NH₃(g), if the equilibrium constant is Kc = 0.5 at 400°C, what is the relationship between forward and reverse reaction rates at equilibrium?

For the equilibrium: 2SO₂(g) + O₂(g) ⇌ 2SO₃(g), the equilibrium constant expression Kc is:

When the pressure on the equilibrium system: N₂(g) + O₂(g) ⇌ 2NO(g) is increased, how does the equilibrium shift?

For the reaction: H₂(g) + I₂(g) ⇌ 2HI(g), Kc = 50 at 440°C. What is the value of Kc for the reverse reaction: 2HI(g) ⇌ H₂(g) + I₂(g)?

In the equilibrium: PCl₅(g) ⇌ PCl₃(g) + Cl₂(g), if temperature is increased, the equilibrium shifts to the right. This indicates that the forward reaction is:

For the equilibrium reaction N₂O₄(g) ⇌ 2NO₂(g), if the equilibrium constant Kc = 4.63 × 10⁻³ at 298 K, what is the value of Kp at the same temperature?

At equilibrium, a 2 L container contains 0.5 mol H₂, 0.5 mol I₂, and 1.0 mol HI. What is the equilibrium constant Kc for the reaction H₂(g) + I₂(g) ⇌ 2HI(g)?

For an equilibrium reaction, if ΔG° = 0 kJ/mol at 298 K, which statement is correct?

In the equilibrium 2SO₂(g) + O₂(g) ⇌ 2SO₃(g), if the initial concentrations are [SO₂] = 0.6 M, [O₂] = 0.3 M, and [SO₃] = 0 M, and x mol/L of O₂ reacts, which expression correctly represents the equilibrium concentration of SO₃?

For the reaction A(g) ⇌ B(g) + C(g), the equilibrium constant Kp is 2.0 atm at 400 K. If the initial pressure of A is 1 atm and it dissociates by 50%, what is the partial pressure of B at equilibrium?

Which of the following changes will shift the equilibrium of the reaction CaCO₃(s) ⇌ CaO(s) + CO₂(g) to the right?

For the equilibrium PCl₅(g) ⇌ PCl₃(g) + Cl₂(g), if Kc = 1.8 × 10⁻² at 250°C, what is the degree of dissociation (α) if initial concentration of PCl₅ is 0.5 M?

In a reversible reaction at constant temperature, if more reactants are added while the system is at equilibrium, which quantity increases immediately?

At 500 K, the equilibrium constant Kc for the reaction N₂(g) + 3H₂(g) ⇌ 2NH₃(g) is 1.7 × 10⁻³. What is Kp for this reaction at the same temperature? (R = 0.0821 L·atm·mol⁻¹·K⁻¹)

A sealed vessel contains PCl₅(g) at equilibrium with PCl₃(g) and Cl₂(g). If the volume of the container is decreased isothermally, which statement correctly describes the shift in equilibrium?

For the reaction 2SO₂(g) + O₂(g) ⇌ 2SO₃(g), ΔH = −198 kJ/mol. If initial concentrations are [SO₂] = 0.5 M, [O₂] = 0.8 M, and [SO₃] = 0 M, and Kc = 280 at 700 K, will the reaction proceed forward or backward?