- For the reaction H2(g)+I2(g)⇌2HI(g)H_2(g) + I_2(g) \rightleftharpoons 2HI(g)H2(g)+I2(g)⇌2HI(g), the equilibrium constant KcK_cKc changes if:
a) The concentration of H2H_2H2 is changed
b) The temperature is changed
c) The pressure is changed
d) A catalyst is added
Answer: b - The Haber process for ammonia synthesis is represented by N2(g)+3H2(g)⇌2NH3(g)N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)N2(g)+3H2(g)⇌2NH3(g). What happens if the temperature is increased?
a) The equilibrium shifts to the right
b) The equilibrium shifts to the left
c) The equilibrium remains unchanged
d) The reaction rate decreases
Answer: b - In the reaction 2NOBr(g)⇌2NO(g)+Br2(g)2NOBr(g) \rightleftharpoons 2NO(g) + Br_2(g)2NOBr(g)⇌2NO(g)+Br2(g), decreasing the temperature will:
a) Shift the equilibrium to the right
b) Shift the equilibrium to the left
c) Increase the value of KcK_cKc
d) Decrease the concentration of Br2Br_2Br2
Answer: b - Which of the following is a correct statement about the effect of pressure on the equilibrium position?
a) It always favors the side with fewer moles of gas
b) It always favors the side with more moles of gas
c) It affects only reactions with equal moles of gas on both sides
d) It has no effect on reactions involving only liquids
Answer: a - For the reaction 2SO2(g)+O2(g)⇌2SO3(g)2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g)2SO2(g)+O2(g)⇌2SO3(g), the equilibrium constant KcK_cKc increases with:
a) Increase in temperature
b) Decrease in temperature
c) Increase in pressure
d) Decrease in pressure
Answer: b - In the reaction C(s)+CO2(g)⇌2CO(g)C(s) + CO_2(g) \rightleftharpoons 2CO(g)C(s)+CO2(g)⇌2CO(g), if the concentration of CO is increased, the equilibrium will:
a) Shift to the right
b) Shift to the left
c) Remain unchanged
d) Increase the concentration of CO2
Answer: b - For the reaction 2H2O(g)⇌2H2(g)+O2(g)2H_2O(g) \rightleftharpoons 2H_2(g) + O_2(g)2H2O(g)⇌2H2(g)+O2(g), increasing the temperature will:
a) Shift the equilibrium to the right
b) Shift the equilibrium to the left
c) Decrease the equilibrium constant
d) Have no effect on equilibrium
Answer: a - For the reaction N2O4(g)⇌2NO2(g)N_2O_4(g) \rightleftharpoons 2NO_2(g)N2O4(g)⇌2NO2(g), if the volume of the container is decreased, the equilibrium will:
a) Shift to the right
b) Shift to the left
c) Remain unchanged
d) Increase the concentration of NO2
Answer: b - The equilibrium constant for an exothermic reaction decreases with:
a) Increase in temperature
b) Increase in pressure
c) Decrease in temperature
d) Decrease in pressure
Answer: a - For the reaction H2(g)+Cl2(g)⇌2HCl(g)H_2(g) + Cl_2(g) \rightleftharpoons 2HCl(g)H2(g)+Cl2(g)⇌2HCl(g), the equilibrium constant KcK_cKc will:
a) Increase if the temperature is decreased
b) Decrease if the temperature is increased
c) Remain unchanged if the concentration of HCl is increased
d) Change if the pressure is increased
Answer: b
