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Chemical Equilibrium MCQ - 1 (Advanced)

25 Questions MCQ Test Chemistry for JEE Advanced | Chemical Equilibrium MCQ - 1 (Advanced)

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Attempt Chemical Equilibrium MCQ - 1 (Advanced) | 25 questions in 60 minutes | Mock test for JEE preparation | Free important questions MCQ to study Chemistry for JEE Advanced for JEE Exam | Download free PDF with solutions

*Multiple options can be correct

QUESTION: 1

Which of the following statements is (are) correct ?

A.
An irreversible reaction goes to almost completion.
B.
a reversible reaction always goes to completion if carried out in a closed vessel
C.
At equilibrium, the rate of forward reaction becomes equal to that of backward reaction.
D.
In the beginning, the rate of backward reaction is much greater than that of forward reaction.

Solution:

*Multiple options can be correct

QUESTION: 2

The value of equilibrium constant of a reversible reaction at a given temperature :

A.
Depends on the initial concentration of reactants
B.
Depends on the concentration of products at equilibrium
C.
Gets reversed when the mode of representation of the reaction is reversed.
D.
Changes when the unit of active mass is changed.

Solution: Equilibrium constant is independent of original concentration of reactant.

*Multiple options can be correct

QUESTION: 3

Which of the following statement is (are) correct ?

A.
The value of equilibrium constant for a particular reaction is constant under all conditions of temperature and pressure.
B.
The unit of K_C for the reaction. H₂O(l) H₂O(g) are mol L^-1
C.
In the reaction CaCO₃(s) CaO(s) + CO₂(g). [CaCO₃] = [CaO] = 1
D.
K_P is always greater than K_c for a particular reaction.

Solution:

*Multiple options can be correct

QUESTION: 4

If is found that the equilibrium constant increases by factor of four when the temperature is increased from 25°C to 40°C. The value of ΔH° is

A.
25.46 kJ
B.
171.65 kJ
C.
89.43 kJ
D.
71.65 kJ

Solution:

As we know

*Multiple options can be correct

QUESTION: 5

Ammonium carbamate dissociates as follows :

NH₂COONH₄(s) 2NH₃(g) + CO₂(g)

The value of K_P for this reaction is found to be equal to 2.92 × 10^-5 atm³. If one mole of ammonium carbamate is heated in a sealed container, the total pressur develped in the container is

A.
0.0194 atm
B.
0.0388 atm
C.
0.0582 atm
D.
0.0667 atm

Solution:

*Multiple options can be correct

QUESTION: 6

The equilibrium constant for the following reactions at 1400 K are given.

2H₂O(g) 2H₂(g) + O₂(g) ; K₁=2.1×10^-13

2CO₂(g)2CO(g)+O₂(g);K₂ = 1.4 × 10^-12

Then, the equilibrium constant K for the reaction

H₂(g) + CO₂(g) CO(g) + H₂O(g) is

A.
2.04
B.
2.6
C.
8.4
D.
20.5

Solution:

*Multiple options can be correct

QUESTION: 7

Under what conditions of temperature and pressure, the formation of atomic hydrogen from molecular hydrogen will be favoured most ?

A.
High temperature and high pressure
B.
Low temperature and low pressure
C.
High temperature and low pressure
D.
Low temperature and high pressure

Solution:

*Multiple options can be correct

QUESTION: 8

For the reaction PCl₅(g) PCl₃(g) + Cl₂(g), the forward reaction at constant temperature is favoured by

A.
Introducing an inert gas at constant volume
B.
Introducing chlorine gas at constant volume
C.
Introducing an inert gas at constant pressure
D.
Introducing PCl₅ at constant volume.

Solution:

Introduction of inet gas at constant Pressure will increase Pressure of gases of equilibrium
⇒ equilibrium shifted forward

*Multiple options can be correct

QUESTION: 9

When NaNO₃(s) is heated in a closed vessel, oxygen is liberated and NaNO₂(s) is left behind. At equilibrium.

A.
Addition of NaNO₂ favours reverse reaction
B.
Addition of NaNO₃ favours forward reaction
C.
Increasing temperature favours forward reaction
D.
Increasing pressure favours reverse reaction

Solution:

High temperature
∴ forward reaction favoured 1000 pressure
High pressure → Reverse reaction

*Multiple options can be correct

QUESTION: 10

Phase diagram of CO₂ is shown as following

Based on above find the correct statement (s)

A.
298 K is the normal boiling point of liquid CO₂
B.
At 1 atm & 190 K CO₂ will exist as gas.
C.
CO₂(s) will sublime above 195 K under normal atmospheric pressure
D.
Melting point & boiling point of CO₂ will increase on increasing pressure.

Solution:

*Multiple options can be correct

QUESTION: 11

The equilibrium between, gaseous isomers A, B and C can be represented as

Reaction Equilibrium constant

A(g) B (g) : K₁ = ?

B(g) C(g) : K₂ = 0.4

C(g) A(g) : K₃ = 0.6

If one mole of A is taken in a closed vessel of volume 1 litre, then

A.
[A] + [B] + [C] = 1 M at any time of the reactions.
B.
Concentration of C is 4.1 M at the attainment equilibrium in all the reactions.
C.
The value of K₁ is
D.
Isomer [A] is least stable as per thermodynamics.

Solution:

*Multiple options can be correct

QUESTION: 12

For the gas phase exothermic reaction.

A₂ + B₂ C₂, carried out in a closed vessel, the equilibrium moles of A₂ can be increased by

A.
Increasing the temperature
B.
Decreasing the pressure
C.
Adding inert gas at constant pressure
D.
Removing some C₂

Solution:

According to Le Chatelier’s Principle A, B and C are correct.

Hence A, B and C

*Multiple options can be correct

QUESTION: 13

Consider the equilibrium

HgO(s) + 4I^-(aq) + H₂O(l) Hg I₄^2-(aq) + 2OH^- (aq), which changes will decrease the equilibrium concentration of HgI₄^2-

A.
Addition of 0.1 M HI (aq)
B.
Addition of HgO(s)
C.
Addition of H₂O (l)
D.
Addition of KOH (aq)

Solution:

As given :

*Multiple options can be correct

QUESTION: 14

In the laboratory the equilibrium constant for a particular reaction can be measured at different temperatures. Plotting the data yields the graph shown. Which of the following statements is false?

(Note : The notation 4.40 e^- 4 is equivalent to 4.40 × 10^-4)

A.
ΔS° can be obtained from the y-intercept
B.
The slope of the line is equal to + (ΔH°/R)
C.
The reaction is endothermic
D.
The standard free energy change of the reaction is positive.

Solution:

slope of the line equal to ΔHº/R

*Multiple options can be correct

QUESTION: 15

Decrease in the pressure for the following equilibria : H₂O (s) H₂O(l) result in the :

A.
Formation of more H₂O (s)
B.
Formation of more H₂O (l)
C.
Increase in melting point of H₂O(s)
D.
Decrease in melting point of H₂O (s)

Solution:

∴ formation of more H₂O (s) and increase in melting point of H₂O (s)

QUESTION: 16

Statement-1 : Water boils at high temperature in pressure cooker.

Statement-2 : Increase in pressure leads to an increase in boiling point.

A.
Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1
B.
Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1
C.
Statement-I is false, statement-2 is true.
D.
Statement-1 is true, statement-2 is false.

Solution:

Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1

QUESTION: 17

Statement-1 : A decrease in pressure leads to an increase in freezing point of water.

Statement-2 : For ice on melting volume decreases.

A.
Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1
B.
Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1
C.
Statement-I is false, statement-2 is true.
D.
Statement-1 is true, statement-2 is false.

Solution:

Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1

QUESTION: 18

Statement-1 : The solubility of gases always increases with increase in pressure.

Statement-2 : High pressure favours the change where volume of gas decreases.

A.
Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1
B.
Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1
C.
Statement-I is false, statement-2 is true.
D.
Statement-1 is true, statement-2 is false.

Solution:

Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1

QUESTION: 19

Statement-1 : Total number of moles in a closed system at new equilibrium is less than the old equilibrium if some amount of a substance is removed from a system.

A(g) B(g) equilibrium.

Statement-2 : The number of moles of the substance which is removed, is partially compensated as the system reached to new equilibrium.

A.
Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1
B.
Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1
C.
Statement-I is false, statement-2 is true.
D.
Statement-1 is true, statement-2 is false.

Solution:

Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1

QUESTION: 20

Statement-1 : An exothermic reaction, non-spontaneous at high temperature, may become spontaneous at low temperature.

Statement-2 : Entropy of an exothermic reaction always decrease with decrease in temperature.

A.
Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1
B.
Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1
C.
Statement-I is false, statement-2 is true.
D.
Statement-1 is true, statement-2 is false.

Solution:

Statement-I is false, statement-2 is true.

QUESTION: 21

Statement-1 : Ammonia at a pressure of 10 atm and CO₂ at a pressure of 20 atm are intoduced into an evacuated chamber. If K_p for the reaction.

NH₂COONH₄(s) 2NH₃(g) + CO₂(g) is 2020 atm³, the total pressure after a long time is less than 30 atm.

Statement-2 : Equilibrium can be attained from both directions.

A.
Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1
B.
Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1
C.
Statement-I is false, statement-2 is true.
D.
Statement-1 is true, statement-2 is false.