Quiz for Chemical Equilibrium-

Q1: What is the equilibrium constant expression for the reaction: N2 + 3H2 ⇌ 2NH3?

A. [NH3]^2 / [N2][H2]^3 B. [N2][H2]^3 / [NH3]^2 C. [N2]^2[H2]^3 / [NH3] D. [NH3] / [N2][H2]^2

Q2: At equilibrium, which of the following is true?

A. The rate of forward reaction = rate of backward reaction B. The concentration of reactants becomes zero C. The reaction stops D. Only the products remain

Q3: Which factor does NOT affect the value of equilibrium constant?

A. Temperature B. Pressure C. Concentration D. Catalyst

Q4: If the equilibrium constant (Kc) > 1, what does it indicate?

A. Reactants are favored B. Products are favored C. No reaction occurs D. System is at initial state

Q5: Le Chatelier’s principle predicts that increasing pressure will shift equilibrium toward:

A. More gaseous moles B. Less gaseous moles C. No change D. Solid products

Q6: The unit of equilibrium constant Kp is:

A. atm B. atm^2 C. Depends on the reaction D. No unit

Q7: Which condition is necessary for dynamic equilibrium?

A. Closed system B. Open system C. Presence of catalyst D. Constant addition of reactants

Q8: The effect of temperature on equilibrium constant is given by:

A. Le Chatelier’s principle B. Arrhenius equation C. Van’t Hoff equation D. Clapeyron equation

Q9: Which of the following increases the rate of attainment of equilibrium?

A. Increasing temperature B. Adding catalyst C. Increasing pressure D. Removing products

Q10: For an exothermic reaction, increasing temperature will:

A. Shift equilibrium to right B. Shift equilibrium to left C. No effect D. Increase Kc

Q11: Which expression correctly represents Kp for reaction: 2SO2 + O2 ⇌ 2SO3?

A. P_SO3^2 / (P_SO2^2 * P_O2) B. P_SO3 / (P_SO2 * P_O2) C. P_SO2^2 * P_O2 / P_SO3^2 D. P_SO3^2 * P_SO2 / P_O2

Q12: At equilibrium, the Gibbs free energy change ΔG is:

A. Positive B. Negative C. Zero D. Infinite

Q13: Kp and Kc are related by:

A. Kp = Kc + RT B. Kp = Kc(RT)^Δn C. Kp = Kc/RT D. Kp = KcRT

Q14: The value of Kc for a reaction is small. What does it imply?

A. Reaction favors products B. Reaction is fast C. Reaction favors reactants D. Reaction is at completion

Q15: Which one is NOT a characteristic of chemical equilibrium?

A. Dynamic in nature B. Concentration remains constant C. Rate of reaction is zero D. Attained in closed system

Q16: Which will increase yield of ammonia in Haber’s process?

A. High pressure and low temperature B. High temperature and low pressure C. Low pressure and low temperature D. High temperature and high pressure

Q17: The equilibrium constant of a reverse reaction is:

A. Same as forward B. Reciprocal of forward C. Square of forward D. Negative of forward

Q18: When Q < K, the reaction will:

A. Move forward B. Move backward C. Be at equilibrium D. Stop

Q19: Which of the following will not disturb chemical equilibrium?

A. Changing pressure B. Adding a catalyst C. Changing temperature D. Changing concentration

Q20: If Kc is 10^-5, what can you say about the extent of reaction?

A. Very large B. Moderate C. Negligible D. Complete