Q. What is the equilibrium constant (Kc) expression for the reaction: 2A + B ⇌ C?
A.
Kc = [C] / ([A]^2[B])
B.
Kc = [A]^2[B] / [C]
C.
Kc = [C] / [A]^2
D.
Kc = [A]^2 / ([B][C])
Solution
The equilibrium constant Kc is defined as the ratio of the concentration of products to the concentration of reactants, each raised to the power of their coefficients in the balanced equation. For the reaction 2A + B ⇌ C, Kc = [C] / ([A]^2[B]).
Q. What is the equilibrium constant (Kc) for the reaction 2A + B ⇌ C? (2022)
A.
Kc = [C] / ([A]^2[B])
B.
Kc = [A]^2[B] / [C]
C.
Kc = [B] / ([A]^2[C])
D.
Kc = [C] / ([B][A])
Solution
The equilibrium constant Kc is defined as the concentration of the products raised to the power of their coefficients divided by the concentration of the reactants raised to the power of their coefficients. For the reaction 2A + B ⇌ C, Kc = [C] / ([A]^2[B]).
Q. What is the equilibrium constant (Kc) for the reaction: A + B ⇌ C + D? (2022)
A.
Kc = [C][D]/[A][B]
B.
Kc = [A][B]/[C][D]
C.
Kc = [C][D][A][B]
D.
Kc = [A][B][C][D]
Solution
The equilibrium constant Kc is defined as the ratio of the concentrations of the products to the reactants, each raised to the power of their coefficients in the balanced equation.
Q. Which of the following changes will not affect the position of equilibrium in the reaction N2(g) + 3H2(g) ⇌ 2NH3(g)? (2021)
A.
Increasing the temperature
B.
Increasing the pressure
C.
Adding a catalyst
D.
Removing NH3
Solution
A catalyst speeds up the rate of both the forward and reverse reactions equally, thus it does not affect the position of equilibrium. Other changes like temperature, pressure, and concentration of reactants/products do affect the equilibrium.
Q. Which of the following factors does NOT affect the position of equilibrium in a chemical reaction? (2021)
A.
Concentration of reactants
B.
Temperature
C.
Pressure
D.
Nature of the reactants
Solution
The nature of the reactants does not affect the position of equilibrium. Changes in concentration, temperature, and pressure can shift the equilibrium position according to Le Chatelier's principle.
