Equilibrium Test

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Equilibrium Test - 55

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Weekly Quiz Competition

Question 1
1 / -0

(A) If water is heated to 350 K, then pOH will increase to 8.
(R) $$K_w$$ increases with increase in temperature.

A
Both (R) and (A) are true and reason is the. correct explanation of assertion

B
Both (R) and (A) are true but reason is not correct explanation of assertion

C
Assertion (A) is true but reason (R) is false

D
Assertion (A) and reason (R) both are false

E
Assertion (A) is false but reason (R) is true

Solution

If water is heated to 350 K, then pOH will increase to 8.
$$K_w$$ increases with increase in temperature. As $$K_w$$ increases pOH increases, pH decreases.

So both (R) and (A) are true and reason is the. correct explanation of assertion.
Hence option A is correct.
Question 2
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Which of the following is not true for the equilibrium reaction? $$N_2(h)+O_2(g)\rightleftharpoons 2NO(g); \Delta H=180$$kJ $$mol^{-1}$$.

A
The formation of NO is increased at higher temperature

B
The volume change at constant pressure does not affect the equilibrium

C
The pressure change at constant volume does not affect the equilibrium

D
The formation of NO is decreased at higher temperature

Solution

solution:
option a:
It's an endothermic reaction as $$\Delta H $$ is positive as temperature increases equilibrium will try to balnce it out by moving right side so its true
option b :
on increasing pressure there is no change in equilibrium as $$\Delta n =0$$
option C :
on increasing volume there is no change in equilibrium as $$\Delta n =0$$
option d:
It's an endothermic reaction as $$\Delta H $$ is positive as temperature increases equilibrium will try to balnce it out by moving right side so it is not true
hence the correct opt: D
Question 3
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Consider the following equilibrium system; $$SO_2(g)+\displaystyle\frac{1}{2}O_2(g)\rightleftharpoons SO_3(g)$$; set up in a cylinder fitted with a piston. Some inert gas is added and the piston is moved outwards to keep the total gaseous pressure constant. Predict which of the following is true?

A
Addition of inert gas does not affect the equilibrium.

B
Less $$SO_3(g)$$ is produced

C
More $$SO_3(g)$$ is produced

D
The system moves to new equilibrium position which cannot be predicted theoretically.
Question 4
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Which of the following would dissolve $$Pb(OH)_{2}$$ more than pure water?

A
Buffer solution having $$pH = 6$$

B
$$0.01\ M\ PbCl_{2}$$ solution

C
$$0.01\ M\ NH_{4}OH$$ solution

D
All of the above

Solution
Question 5
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The exothermic formation of $$ClF_{3}$$ is represented by the equation:
$$Cl_{2}(g) + 3F_{2}(g) \rightleftharpoons 2ClF_{3}(g); \triangle H_{r} = -329\ kJ$$
which of the following will increase the quantity of $$ClF_{3}$$ in an equilibrium mixture of $$Cl_{2}, F_{2}$$ and $$ClF_{3}$$?

A
Removing $$Cl_{2}$$

B
Increasing the temperature

C
Adding inert gas at constant pressure

D
Decreasing the volume of the container
Question 6
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Which of the following does not contribute towards the formation of photochemical smog ?

A
$$NO$$

B
$$SO_2$$

C
$$O_3$$

D
Hydrocarbon

Solution

Photochemical smog is formed by the combination of smoke/dust/fog articles with the oxides of Nitrogen (Like $$NO$$) and Hydrocarbons in the presence of sunlight. It is brown in colour ad hazy.
Ozone ($$O_{3}$$) contributes towards photochemical smog as it acts as an initiator of various reactions that lead to the formation of photochemical smog.
On the other hand, $$SO_{2}$$ does not contribute in any way towards photochemical smog.
Hence, correct answer is (B) $$SO_{2}$$
Question 7
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Solid ammonium carbonate dissociates as:$${ NH }_{ 2 }COO{ NH }_{ 4 }(s)\rightleftharpoons 2{ NH }_{ 3 }(g)+{ CO }_{ 2 }(g)$$. In a closed vessel solid ammonium carbonate is in equilibrium with its dissociation products. At equilibrium, ammonia is added such that the partial pressure of $${NH}_{3}$$ at new equilibrium now equals the original total pressure. Calculate the ratio of total pressure at new equilibrium to that of original total pressure.

A
$$\dfrac{4}{9}$$

B
$$\dfrac{31}{27}$$

C
$$\dfrac{27}{31}$$

D
$$\dfrac{9}{4}$$
Question 8
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The exothermic formation of $$Cl{F}_{3}$$ is represented by the equation:

$${ Cl }_{ 2(g) }+2{ F }_{ 2(g) }\rightleftharpoons 2Cl{ F }_{ 3(g) };\Delta { H }_{ r }=-329kJ\quad $$

Which of the following will increase the quantity of $$Cl{F}_{3}$$ in an equilibrium mixture of $${Cl}_{2},{F}_{2}$$ and $$Cl{F}_{3}$$?

A
Removing $${Cl}_{2}$$

B
Increasing the temperature

C
Adding $$F_2$$

D
Increasing the volume of the container

Solution

For the given reaction $$C{l_2}(g) + 2{F_2}(g) \rightleftharpoons 2Cl{F_3}(g)$$, the enthalpy change of the reaction is given as$$\vartriangle {H_r} = - 329kJ$$ . We know that if the enthalpy change is negative then the reaction is an exothermic reaction. Therefore, according to Le Chatlier’s principle increasing the temperature will shift the equilibrium towards the side of the reactants and hinder the formation of the product.

Removing $$C{l_2}$$ will result in the decrease in the quantity of the product, since the equilibrium of the reaction will move backward.

By increasing the volume of the container the value of $${Q_c}$$ will become greater than the value of $${K_c}$$ hence favoring the backward reaction and resulting in the decrease of the quantity of the product.

So, for the given reaction if we want to increase the quantity of the product $$Cl{F_3}$$ then the correct option will be to add $${F_2}$$ so that the to decrease the concentration of $${F_2}$$ and to bring the system into equilibrium the reaction will move forward and hence the quantity of the product $$Cl{F_3}$$ will increase.

Hence, the correct option is C.) Adding $${F_2}$$
Question 9
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The reaction, $$ZnO(s)+CO(g)\rightleftharpoons Zn(g)+{ CO }_{ 2 }(g)$$ has an equilibrium constant of $$1$$ atm at $$1500K$$. The equilibrium partial pressure of zinc vapour in a reaction vessel if an equimolar mixture of $$CO$$ and $${CO}_{2}$$ is brought into contact with solid $$ZnO$$ at $$1500K$$ and the equilibrium is achieved at $$1$$ atm is?

A
$$0.68$$ atm

B
$$0.76$$ atm

C
$$0.24$$ atm

D
$$0.5$$ atm
Question 10
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In which one of the following equilibria, the increase of pressure over the equilibrium will favour the backward reaction?

A
Decomposition equilibrium of $$HI$$

B
Formation equilibrium of $$SO_{3}$$

C
Decomposition equilibrium of $$NH_{3}$$

D
Formation equilibrium of $$PCl_{5}$$

Solution

In the decomposition reaction of $$NH_{3}$$ the number of moles of products formed is greater than that of reactant involved.
$$2NH_{3}\rightleftharpoons N_{2} + 3H_{2}$$
According to Le-Chatelier's principle, the increase of pressure on a chemical equilibrium shift in that direction in which the number of gaseous molecules decreases and vice-versa thus in this reaction, increase in pressure favours the backward reaction.

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Equilibrium Test - 55

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Equilibrium Test - 55

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Question 1

Both (R) and (A) are true and reason is the. correct explanation of assertion

Both (R) and (A) are true but reason is not correct explanation of assertion

Assertion (A) is true but reason (R) is false

Assertion (A) and reason (R) both are false

Assertion (A) is false but reason (R) is true

Solution

Question 2

The formation of NO is increased at higher temperature

The volume change at constant pressure does not affect the equilibrium

The pressure change at constant volume does not affect the equilibrium

The formation of NO is decreased at higher temperature

Solution

Question 3

Addition of inert gas does not affect the equilibrium.

Less $$SO_3(g)$$ is produced

More $$SO_3(g)$$ is produced

The system moves to new equilibrium position which cannot be predicted theoretically.

Question 4

Buffer solution having $$pH = 6$$

$$0.01\ M\ PbCl_{2}$$ solution

$$0.01\ M\ NH_{4}OH$$ solution

All of the above

Solution

Question 5

Removing $$Cl_{2}$$

Increasing the temperature

Adding inert gas at constant pressure

Decreasing the volume of the container

Question 6

$$NO$$

$$SO_2$$

$$O_3$$

Hydrocarbon

Solution

Question 7

$$\dfrac{4}{9}$$

$$\dfrac{31}{27}$$

$$\dfrac{27}{31}$$

$$\dfrac{9}{4}$$

Question 8

Removing $${Cl}_{2}$$

Increasing the temperature

Adding $$F_2$$

Increasing the volume of the container

Solution

Question 9

$$0.68$$ atm

$$0.76$$ atm

$$0.24$$ atm

$$0.5$$ atm

Question 10

Decomposition equilibrium of $$HI$$

Formation equilibrium of $$SO_{3}$$

Decomposition equilibrium of $$NH_{3}$$

Formation equilibrium of $$PCl_{5}$$

Solution

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