41. What is the effect of decreasing the concentration of a product in a system at equilibrium?
a) Shifts equilibrium to the right
b) Shifts equilibrium to the left
c) No change in equilibrium position
d) Decreases the equilibrium constant
Answer: a) Shifts equilibrium to the right
42. In the reaction H2(g)+Cl2(g)⇌2HCl(g)H_2(g) + Cl_2(g) \rightleftharpoons 2HCl(g)H2(g)+Cl2(g)⇌2HCl(g), what happens when pressure is increased?
a) Equilibrium shifts to the right
b) Equilibrium shifts to the left
c) No effect on equilibrium position
d) Reaction rate decreases
Answer: c) No effect on equilibrium position
43. What is the effect of increasing temperature on an endothermic reaction at equilibrium?
a) Shifts equilibrium to the right
b) Shifts equilibrium to the left
c) No effect on equilibrium position
d) Decreases the equilibrium constant
Answer: a) Shifts equilibrium to the right
44. What is the effect of adding a catalyst to a reaction mixture at equilibrium?
a) Increases the equilibrium constant
b) Decreases the equilibrium constant
c) Increases the rate at which equilibrium is achieved
d) Shifts equilibrium to the right
Answer: c) Increases the rate at which equilibrium is achieved
45. Which of the following reactions is an example of a homogeneous equilibrium?
a) CaCO3(s)⇌CaO(s)+CO2(g)CaCO_3(s) \rightleftharpoons CaO(s) + CO_2(g)CaCO3(s)⇌CaO(s)+CO2(g)
b) N2(g)+3H2(g)⇌2NH3(g)N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)N2(g)+3H2(g)⇌2NH3(g)
c) C(s)+CO2(g)⇌2CO(g)C(s) + CO_2(g) \rightleftharpoons 2CO(g)C(s)+CO2(g)⇌2CO(g)
d) H2O(l)⇌H2O(g)H_2O(l) \rightleftharpoons H_2O(g)H2O(l)⇌H2O(g)
Answer: b) N2(g)+3H2(g)⇌2NH3(g)N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)N2(g)+3H2(g)⇌2NH3(g)
46. What happens to the equilibrium constant (KcK_cKc) when the temperature of an endothermic reaction is decreased?
a) Increases
b) Decreases
c) Remains constant
d) Becomes zero
Answer: b) Decreases
47. Which of the following best describes a reaction with a KcK_cKc value close to 1?
a) Reactants are favored
b) Products are favored
c) Reactants and products are present in comparable amounts
d) Reaction is not at equilibrium
Answer: c) Reactants and products are present in comparable amounts
48. In the reaction 2NO(g)+Cl2(g)⇌2NOCl(g)2NO(g) + Cl_2(g) \rightleftharpoons 2NOCl(g)2NO(g)+Cl2(g)⇌2NOCl(g), what happens when NONONO is added?
a) Equilibrium shifts to the right
b) Equilibrium shifts to the left
c) No effect on equilibrium position
d) Reaction rate decreases
Answer: a) Equilibrium shifts to the right
49. What is the effect of increasing temperature on the equilibrium constant (KcK_cKc) for an exothermic reaction?
a) Increases
b) Decreases
c) Remains constant
d) Becomes zero
Answer: b) Decreases
50. Which of the following factors influences the position of equilibrium in a chemical reaction?
a) Temperature
b) Pressure
c) Concentration
d) All of the above
Answer: d) All of the above
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