Q1. What happens to the equilibrium position when a catalyst is added to a reaction at equilibrium? (2023)
Solution:
A catalyst speeds up both the forward and reverse reactions equally, thus it does not change the position of equilibrium or the value of Kc.
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Q2. For the equilibrium reaction A ⇌ B, if the concentration of B is increased, what will be the effect on the equilibrium? (2023)
Solution:
Increasing the concentration of B will shift the equilibrium to the left to produce more A, according to Le Chatelier's principle.
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Q3. In a reversible reaction at equilibrium, if the concentration of reactants is increased, what will happen to the equilibrium position? (2023)
Solution:
According to Le Chatelier's principle, increasing the concentration of reactants will shift the equilibrium position to the right, favoring the formation of products.
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Q4. What happens to the equilibrium constant when a reaction is multiplied by a factor? (2023)
Solution:
When a balanced equation is multiplied by a factor, the equilibrium constant is raised to the power of that factor.
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Q5. For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what is the expression for the equilibrium constant Kp? (2020)
Solution:
Kp is expressed in terms of the partial pressures of the gases involved in the reaction. For this reaction, Kp = (P_NH3)^2 / (P_N2)(P_H2)^3.
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Q6. For the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), what is the effect of decreasing the volume? (2021)
Solution:
Decreasing the volume increases the pressure, and according to Le Chatelier's principle, the equilibrium will shift towards the side with fewer moles of gas, which is the right side in this case.
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Q7. Which of the following statements is true about the equilibrium constant? (2019)
Solution:
The equilibrium constant Kc is temperature-dependent; it changes with temperature but is constant for a given reaction at a specific temperature.
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Q8. For the reaction: 2A(g) + B(g) ⇌ 3C(g), if the volume of the container is decreased, what will be the effect on the equilibrium? (2022)
Solution:
Decreasing the volume increases the pressure, and the equilibrium will shift towards the side with fewer moles of gas. Here, it shifts to the right, producing more C.
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Q9. For the equilibrium reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), what is the effect of decreasing the volume of the container? (2021)
Solution:
Decreasing the volume increases the pressure, and according to Le Chatelier's principle, the equilibrium will shift towards the side with fewer moles of gas, which is the right side in this case.
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Q10. In the reaction CO(g) + 2H2(g) ⇌ CH3OH(g), what is the effect of increasing the concentration of CO? (2023)
Solution:
Increasing the concentration of CO will shift the equilibrium to the right, favoring the formation of CH3OH.
