1. Chemical equilibrium is achieved when:
A) Reactants are completely used
B) Forward reaction stops
C) Rate of forward and reverse reactions are equal
D) Products stop forming
Answer: C
2. At equilibrium, concentration of reactants and products:
A) Are equal
B) Remain constant
C) Become zero
D) Fluctuate continuously
Answer: B
3. The equilibrium constant (Kc) depends on:
A) Concentration
B) Temperature
C) Pressure
D) Volume
Answer: B
4. Which of the following is true for dynamic equilibrium?
A) Reactions stop
B) Only forward reaction occurs
C) Both reactions continue
D) Only reverse reaction occurs
Answer: C
5. The unit of Kc depends on:
A) Temperature
B) Reaction type
C) Stoichiometry
D) Pressure
Answer: C
6. For a reversible reaction, equilibrium is:
A) Static
B) Dynamic
C) Permanent
D) Irreversible
Answer: B
7. Increasing temperature in an endothermic reaction shifts equilibrium:
A) Left
B) Right
C) No change
D) Stops reaction
Answer: B
8. Le Chatelier’s principle states that system:
A) Remains unchanged
B) Opposes change
C) Accepts change
D) Stops reaction
Answer: B
9. Adding reactant shifts equilibrium:
A) Left
B) Right
C) No change
D) Stops reaction
Answer: B
10. Removing product shifts equilibrium:
A) Left
B) Right
C) No change
D) Stops reaction
Answer: B