Equilibrium Test 8

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Equilibrium Test 8

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Question 1
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Direction (Q. Nos. 1-8) This section contains 8 multiple choice questions. Each question has four
choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.
Q. The equilibrium which is not affected by volume change at constant temperature is

A
H₂(g) +I₂(g)2HI(g)

B
N₂ (g) + 3H₂(g) 2NH₃(g)

C
N₂O₄(g) 2NO₂(g)

D
2NO(g) +O₂(g) 2NO₂(g)

Solution

As the number of moles of reactants and products is the same. Hence, they both will occupy equal volume at the same temperature.
Therefore, the reaction A i.e., H2 (g) +I2 (g) ⇌ 2HI (g) is not affected by change in pressure and volume.
Question 2
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In each of the following equilibria, pressure is made four times after equilibrium is set up. In which case yield of the product(s) is maximum?

A
N₂O₄ (g)2NO₂(g)

B
C(s) + H₂O(g) CO(g) +H₂(g)

C
N₂(g) + 3H₂(g)2NH₃(g)

D
2Fe(s) +3H₂O (g) Fe₂O₃(s) + 3H₂(g)
Question 3
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The binding of oxygen by haemoglobin (Hb) forming (HbO₂), is partially regulated by the concentration of H₃O + and dissolved CO₂ in blood.
Release of O₂ is favoured when there is

A
production of CO₂ during excertion

B
production of lactic acid during excertion

C
Both (a) and (b) take place

D
None of (a) and (b) takes place

Solution

During exercise muscle need energy hence consume more oxygen and produce more CO₂ and lactic acid gets accumulated as well. According to bohr's effect oxygen binding affinity is inversely proportional to CO₂ concentration and acidity. Thus favours the dissociation or release of O₂.
Question 4
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Aerated water contains CO₂ dissolved in water
CO₂(g) + H₂O(l) H₂CO₃(aq)

Variation of solubility (s) with pressure (p) is shown by

A

B

C

D

Solution

Pressure increase solubility also increase in accordance with the Henry's law and option B is the closest to this. Hence B is correct.
Question 5
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Variation of log K_p with temperature. 1/T is given by for the equilibrium.
NH₄HS (s) NH₃(g) + H₂S
Q. The equilibrium is displaced in forward side on

A
increasing temperature and decreasing pressure

B
increasing temperature and pressure both

C
decreasing temperature and pressure both

D
decreasing temperature and increasing pressure

Solution

The correct answer is Option A.
When ammonia is added after equilibrium is established, the partial pressure of ammonia will increase.When the temperature of an endothermic reaction is increased, the equilibrium will shift in the forward direction so that the heat is absorbed which will nullify the effect of increased temperature. Hence, the partial pressure of ammonia will increase.When the volume of the flask is increased, the pressure will decrease.
Question 6
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In the following equilibrium AB A⁺ + B^-
AB is 10% dissociated, when [AB] = 1M
Q. What is per cent dissociation if 1 M AB is dissociated in the presence of 1 M A⁺?

A
5.2%

B
6.0%

C
1.1%

D
10.0%

Solution

The correct answer is option C
Let initially
AB = 1M
AB = A⁺ + B^-
⇒1 - 0.1

K should remain same
AB ⇌ A⁺ + B^-
1-x
Question 7
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When hydrochloric acid is added to cobalt (II) nitrate solution at room temperature, the following reaction takes place
Q. The solution is blue at room temperature. However, it turns pink when cooled in a freezing mixture. Based upon this information, which of the following expression is correct for the forward reaction?

A
ΔH > 0

B
ΔH < 0

C
ΔH = 0

D
The sign of ΔH can’t be predicted based on the given information

Solution

According to the given information, the solution turns pink when cooled in freezing mixture. So, the equilibrium has shifted in backward direction. So we can say that the reaction is endothermic and ∆H for the reaction is greater than zero. This is because, endothermic reactions have ∆H > 0 and they proceed in reverse direction.
Question 8
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Consider the following equilibrium in a closed container
N₂O₄ (g)2NO₂(g)
At a fixed temperature, the volume of a reaction container is halved. For this change, which of the following statements holds true regarding the equilibrium constant (K_p) and degree of dissociation (α) ?

A
Neither K_p nor α change

B
Both K_p and α change

C
K_p changes but α does not change

D
K_p does not change but α changes

Solution

We know that K_p depends only on Temperature. As the temp. remains constant , K_p also remains constant.
α depends on the concentration of the reactant
So as the volume of the reaction container is halved, α also changes
So option d is correct.