chemistry : class11 Homogeneous Equilibrium : Equilibrium in chemical processes : Equilibrium MCQ Questions and Answers
Practice important
Homogeneous Equilibrium
MCQ questions and answers.
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MCQ Questions
1. Which reaction represents a homogeneous equilibrium?
A.
H2(g) + I2(g) ⇌ 2HI(g)
B.
CaCO3(s) ⇌ CaO(s) + CO2(g)
C.
H2O(l) ⇌ H+(aq) + OH−(aq)
D.
Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)
Correct Answer:
H2(g) + I2(g) ⇌ 2HI(g)
Explanation:
In H2(g) + I2(g) ⇌ 2HI(g), all reactants and products are gases, so the equilibrium is homogeneous because all species are in the same phase.
2. In a homogeneous equilibrium, the reacting species are present in:
A.
Different phases
B.
Only the solid phase
C.
The same phase
D.
Only different physical states
Correct Answer:
The same phase
Explanation:
A homogeneous equilibrium contains all reactants and products in the same physical phase, such as all gases or all aqueous species.
3. Which equilibrium is homogeneous in the gaseous phase?
A.
N2(g) + 3H2(g) ⇌ 2NH3(g)
B.
C(s) + O2(g) ⇌ CO2(g)
C.
CaCO3(s) ⇌ CaO(s) + CO2(g)
D.
AgCl(s) ⇌ Ag+(aq) + Cl−(aq)
Correct Answer:
N2(g) + 3H2(g) ⇌ 2NH3(g)
Explanation:
All species in the ammonia formation equilibrium are gases, making it a homogeneous gaseous equilibrium.
4. What is the equilibrium constant expression for H2(g) + I2(g) ⇌ 2HI(g)?
A.
Kc = [H2][I2]/[HI]2
B.
Kc = [HI]2/([H2][I2])
C.
Kc = [HI]/([H2][I2])
D.
Kc = [H2][I2][HI]2
Correct Answer:
Kc = [HI]2/([H2][I2])
Explanation:
For a homogeneous equilibrium, the equilibrium constant is written as the concentration of products divided by the concentration of reactants, with each concentration raised to its stoichiometric coefficient.
5. For the homogeneous equilibrium N2(g) + 3H2(g) ⇌ 2NH3(g), which expression represents Kc?
A.
Kc = [N2][H2]3/[NH3]2
B.
Kc = [NH3]2/([N2][H2]3)
C.
Kc = [NH3]/([N2][H2])
D.
Kc = [N2][H2][NH3]
Correct Answer:
Kc = [NH3]2/([N2][H2]3)
Explanation:
The products and reactants are all gases, and their concentrations appear in Kc with powers equal to their coefficients in the balanced equation.
6. Which of the following is a homogeneous aqueous equilibrium?
Explanation:
All species in the acetic acid ionization equilibrium are aqueous, so they exist in the same phase and form a homogeneous equilibrium.
7. At homogeneous equilibrium, the concentrations of reactants and products:
A.
Become equal
B.
Remain constant with time
C.
Become zero
D.
Continuously increase
Correct Answer:
Remain constant with time
Explanation:
At equilibrium, the forward and reverse reaction rates are equal. Therefore, the concentrations of all species remain constant, although the reactions continue.
8. For the homogeneous equilibrium 2SO2(g) + O2(g) ⇌ 2SO3(g), which species is in the same phase as all the others?
A.
SO2(g)
B.
O2(g)
C.
SO3(g)
D.
All three species
Correct Answer:
All three species
Explanation:
SO2, O2, and SO3 are all gases. Since every species is in the gaseous phase, the equilibrium is homogeneous.
9. Which statement about a homogeneous equilibrium is correct?
A.
It contains reactants and products in different phases
B.
It contains only solids
C.
All reacting species are in the same phase
D.
It cannot reach a dynamic equilibrium
Correct Answer:
All reacting species are in the same phase
Explanation:
The defining feature of homogeneous equilibrium is that all reactants and products are present in one physical phase.
10. For the homogeneous equilibrium CO(g) + H2O(g) ⇌ CO2(g) + H2(g), which is the correct Kc expression?
A.
Kc = [CO][H2O]/([CO2][H2])
B.
Kc = [CO2][H2]/([CO][H2O])
C.
Kc = [CO2]/([CO][H2O][H2])
D.
Kc = [CO][H2O][CO2][H2]
Correct Answer:
Kc = [CO2][H2]/([CO][H2O])
Explanation:
For this homogeneous gaseous equilibrium, Kc is the product of the concentrations of products divided by the product of the concentrations of reactants.