IB Chemistry SL - Equilibrium MCQ

Dynamic equilibria This question is about the equilibrium established between hydrogen, iodine and hydrogen iodide; H₂ + I₂ ⇌ 2 HI

(a) If the system is at equilibrium, indicate whether the statements below are True or False;

The rate of the forward and backward reaction must be the same

• True

• False

Dynamic equilibria This question is about the equilibrium established between hydrogen, iodine and hydrogen iodide; H₂ + I₂ ⇌ 2 HI

(a) If the system is at equilibrium, indicate whether the statements below are True or False;

The concentration of the reactants and products is the same

• True

• False

Dynamic equilibria This question is about the equilibrium established between hydrogen, iodine and hydrogen iodide; H₂ + I₂ ⇌ 2 HI

(a) If the system is at equilibrium, indicate whether the statements below are True or False;

The equilibrium must have been established by reacting hydrogen with iodine

• True

• False

Dynamic equilibria This question is about the equilibrium established between hydrogen, iodine and hydrogen iodide; H₂ + I₂ ⇌ 2 HI

(a) If the system is at equilibrium, indicate whether the statements below are True or False;

The system must be sealed

• True

• False

Dynamic equilibria This question is about the equilibrium established between hydrogen, iodine and hydrogen iodide; H₂ + I₂ ⇌ 2 HI

If the system is at equilibrium, indicate whether the statements below are True or False;

Iodine is purple in colour. Hydrogen and hydrogen iodide are colourless. Therefore as the iodine is used up, the colour of the system will gradually fade

• True

• False

Dynamic equilibria This question is about the equilibrium established between hydrogen, iodine and hydrogen iodide; H₂ + I₂ ⇌ 2 HI

If the system is at equilibrium, indicate whether the statements below are True or False;

The pressure of the system will remain constant

• True

• False

The equilibrium constant, K , for the reaction

2A + 4B 2C + 4D

has a value of 4.0. What is the value of K for the reaction below at the same

temperature?

C + 2D ⇌ A + 2B

• 0.25

• 0.50

• 1.0

• 16

Consider the reaction:

2N₂O (g) ⇌ 2N₂ (g) + O₂ (g)

The values of K at different temperatures are in the table.

Which statement is correct at higher temperature?

• The forward reaction is favoured.

• The reverse reaction is favoured.

• The rate of the reverse reaction is greater than the rate of the

  forward reaction.

• The concentration of both reactants and products increase.

What occurs when the pressure on the given equilibrium is increased

at constant temperature?

N₂(g) + O₂ (g)⇌ 2NO(g) ΔH = +180 kJ

• K increases and the position of equilibrium moves to the right.

• K stays the same and the position of equilibrium is unchanged

• K stays the same and the position of equilibrium moves to the left.

• K decreases and the position of equilibrium moves to the left.

Which factor does not affect the position of equilibrium in this

reaction?

2NO₂(g)⇌ N₂O (g) ΔH = −58 kJ mol^-1

• Change in volume of the container

• Change in temperature

• Addition of a catalyst

• Change in pressure