MCQs (One or More Correct Option): Equilibrium - JEE Advanced

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Test: MCQs (One or More Correct Option): Equilibrium | JEE Advanced - Question 1

For the gas phase reaction :
carried out in a vessel, the equilibrium concentration of C₂H₄ can be increased by :

A.
increasing the temperature
B.
decreasing the pressure
C.
removing some H₂
D.
adding some C₂H₆

Detailed Solution: Question 1

The reaction is exothermic, hence increasing temperature will favour backward reaction (i.e. conc. of C₂H₄ increases) removing H₂ and adding C₂H₆ favours backward reaction.

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Test: MCQs (One or More Correct Option): Equilibrium | JEE Advanced - Question 2

When NaNO₃ is heated in a closed vessel, oxygen is liberated and NaNO₂ 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

Detailed Solution: Question 2

According to Le-chatelier principle an increase in pressure always favours the reaction, where volume or moles decrease (i.e. reverse direction). As heat is added, i.e. reaction is endothermic and is supported in forward direction with increase in temperature.

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Test: MCQs (One or More Correct Option): Equilibrium | JEE Advanced - Question 3

The equilibrium :
is attained at 25ºC in a closed container and an inert gas, helium is introduced. Which of the following statements are correct?

A.
Concentration of SO₂, Cl₂ and SO₂Cl₂ do not change
B.
More chlorine is formed
C.
Concentration of SO₂ is reduced
D.
More SO₂Cl₂ is formed.

Detailed Solution: Question 3

At constant volume, concentrations do not change.

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Test: MCQs (One or More Correct Option): Equilibrium | JEE Advanced - Question 4

For the reaction :
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.
increasing the volume of the container
E.
introducing PCl₅ at constant volume

Detailed Solution: Question 4

Introduction of an inert gas at constant pressure causes the equilibrium to shift in a direction in which number of moles increases. The forward reaction is further accelerated by increase in the quantity of substrate, i.e., PCl₅ and by the increase of space, i.e., volume of container.

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Test: MCQs (One or More Correct Option): Equilibrium | JEE Advanced - Question 5

For the reaction at a given temperature the equilibrium amount of CO₂(g) can be increased by

A.
adding a suitable catalyst
B.
adding an inert gas
C.
decreasing the volume of the container
D.
increasing the amount of CO(g).

Detailed Solution: Question 5

A catalyst simply helps in attaining the equilibrium earlier.
Addition of inert gas has no effect on a reaction because in it Δn = 0.
This equilibrium is not based upon volume because in it Δn = 0.
On increasing the amount of CO, K_C will decrease but it is constant at constant temperature, so for maintaining the constant value of K_C, the amount of CO₂ increases.

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Test: MCQs (One or More Correct Option): Equilibrium | JEE Advanced - Question 6

Which of the following statements(s) is (are) correct?

A.
The pH of 1.0 × 10^–8 M solution of HCl is 8
B.
The conjugate base of
C.
Autoprotolysis constant of water increases with temperature
D.
When a solution of a weak monoprotic acid is titrated against a strong base, at half-neutralisation point pH = (1/2) pK_a

Detailed Solution: Question 6

pH of 1 x 10^-8 M is below 7 because it is an acid.

K (Auto protolysis constant of water i.e. ionic product of water) increases with temperature. For half neutralisation of a weak acid by a weak base,

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Test: MCQs (One or More Correct Option): Equilibrium | JEE Advanced - Question 7

A buffer solution can be prepared from a mixture of

A.
sodium acetate and acetic acid in water
B.
sodium acetate and hydrochloric acid in water
C.
ammonia and ammonium chloride in water
D.
ammonia and sodium hydroxide in water

Detailed Solution: Question 7

A buffer solution is prepared by mixing a weak acid/ base with salt of its conjugate base/acid.

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Test: MCQs (One or More Correct Option): Equilibrium | JEE Advanced - Question 8

Aqueous solutions of HNO₃ , KOH, CH₃COOH and CH₃COONa of identical concentrations are provided. The pair(s) of solutions which form a buffer upon mixing is(are)

A.
HNO₃ and CH₃COOH
B.
KOH and CH₃COONa
C.
HNO₃ and CH₃COONa
D.
CH₃COOH and CH₃COONa

Detailed Solution: Question 8

Any solution of a weak acid and its salt with strong base acts as an acidic buffer solution.
If volume of HNO₃ solution added is less as compared to that of CH₃COONa solution, it results in the formation of an acidic buffer solution.

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Test: MCQs (One or More Correct Option): Equilibrium | JEE Advanced - Question 9

The initial rate of hydrolysis of methyl acetate (1M) by a weak acid (HA, 1M) is 1/100^th of that of a strong acid (HX, 1M), at 25°C. The K_a of HA is

A.
1 × 10^–4
B.
1 × 10^–5
C.
1 × 10^–6
D.
1 × 10^–3

Detailed Solution: Question 9

As ester hydrolysis is first order with respect [H⁺].

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Test: MCQs (One or More Correct Option): Equilibrium | JEE Advanced - Question 10

The K_sp of Ag₂CrO₄ is 1.1 × 10^–12 at 298 K. The solubility (in mol/L) of Ag₂CrO₄ in a 0.1 M AgNO₃ solution is

A.
1.1 × 10^–11
B.
1.1 × 10^–10
C.
1.1 × 10^–12
D.
1.1 × 10^–9

Detailed Solution: Question 10

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Test: MCQs (One or More Correct Option): Equilibrium | JEE Advanced - Question 11

The thermal dissociation equilibrium of CaCO₃(s) is studied under different conditions
For this equilibrium, the correct statement(s) is(are)

A.
ΔH is dependent on T
B.
K is independent of the initial amount of CaCO₃
C.
K is dependent on the pressure of CO₂ at a given T
D.
ΔH is independent of catalyst, if any

Detailed Solution: Question 11

Hence enthalpy depends on temperature.

(C) K_eq depends only on temperature and not on Pressure.
(D) Enthalpy of reaction is independent of the catalyst.
Catalyst generaly changes activation energy.

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Test: MCQs (One or More Correct Option): Equilibrium | JEE Advanced - Question 12

The %yield of ammonia as a function of time in the reaction is given below
If this reaction is conducted at (P, T₂), with T₂ > T₁, the %yield of ammonia as a function of time is represented by

Detailed Solution: Question 12

Initially on increasing temperature rate of reaction will increase, so % yield will also increase with time. But at equilibrium % yield at high temperature (T₂) would be less than at T₁ as reaction is exothermic so the graph is

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MCQ Practice Test & Solutions: Test: MCQs (One or More Correct Option): Equilibrium | JEE Advanced (12 Questions)

For the gas phase reaction :
carried out in a vessel, the equilibrium concentration of C₂H₄ can be increased by :

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

The equilibrium :
is attained at 25ºC in a closed container and an inert gas, helium is introduced. Which of the following statements are correct?

For the reaction :
The forward reaction at constant temperature is favoured by

For the reaction at a given temperature the equilibrium amount of CO₂(g) can be increased by

Which of the following statements(s) is (are) correct?

A buffer solution can be prepared from a mixture of

Aqueous solutions of HNO₃ , KOH, CH₃COOH and CH₃COONa of identical concentrations are provided. The pair(s) of solutions which form a buffer upon mixing is(are)

The initial rate of hydrolysis of methyl acetate (1M) by a weak acid (HA, 1M) is 1/100^th of that of a strong acid (HX, 1M), at 25°C. The K_a of HA is

The K_sp of Ag₂CrO₄ is 1.1 × 10^–12 at 298 K. The solubility (in mol/L) of Ag₂CrO₄ in a 0.1 M AgNO₃ solution is

The thermal dissociation equilibrium of CaCO₃(s) is studied under different conditions
For this equilibrium, the correct statement(s) is(are)

The %yield of ammonia as a function of time in the reaction is given below
If this reaction is conducted at (P, T₂), with T₂ > T₁, the %yield of ammonia as a function of time is represented by

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MCQs (One or More Correct Option): Equilibrium | JEE Advanced - Free MCQ

MCQ Practice Test & Solutions: Test: MCQs (One or More Correct Option): Equilibrium | JEE Advanced (12 Questions)

For the gas phase reaction :carried out in a vessel, the equilibrium concentration of C2H4 can be increased by :

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

The equilibrium :is attained at 25ºC in a closed container and an inert gas, helium is introduced. Which of the following statements are correct?

For the reaction :The forward reaction at constant temperature is favoured by

For the reaction at a given temperature the equilibrium amount of CO2(g) can be increased by

Which of the following statements(s) is (are) correct?

A buffer solution can be prepared from a mixture of

Aqueous solutions of HNO3 , KOH, CH3COOH and CH3COONa of identical concentrations are provided. The pair(s) of solutions which form a buffer upon mixing is(are)

The initial rate of hydrolysis of methyl acetate (1M) by a weak acid (HA, 1M) is 1/100th of that of a strong acid (HX, 1M), at 25°C. The Ka of HA is

The Ksp of Ag2CrO4 is 1.1 × 10–12 at 298 K. The solubility (in mol/L) of Ag2CrO4 in a 0.1 M AgNO3 solution is

The thermal dissociation equilibrium of CaCO3(s) is studied under different conditionsFor this equilibrium, the correct statement(s) is(are)

The %yield of ammonia as a function of time in the reaction is given belowIf this reaction is conducted at (P, T2), with T2 > T1, the %yield of ammonia as a function of time is represented by

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For the gas phase reaction :
carried out in a vessel, the equilibrium concentration of C₂H₄ can be increased by :

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

The equilibrium :
is attained at 25ºC in a closed container and an inert gas, helium is introduced. Which of the following statements are correct?

For the reaction :
The forward reaction at constant temperature is favoured by

For the reaction at a given temperature the equilibrium amount of CO₂(g) can be increased by

Aqueous solutions of HNO₃ , KOH, CH₃COOH and CH₃COONa of identical concentrations are provided. The pair(s) of solutions which form a buffer upon mixing is(are)

The initial rate of hydrolysis of methyl acetate (1M) by a weak acid (HA, 1M) is 1/100^th of that of a strong acid (HX, 1M), at 25°C. The K_a of HA is

The K_sp of Ag₂CrO₄ is 1.1 × 10^–12 at 298 K. The solubility (in mol/L) of Ag₂CrO₄ in a 0.1 M AgNO₃ solution is

The thermal dissociation equilibrium of CaCO₃(s) is studied under different conditions
For this equilibrium, the correct statement(s) is(are)

The %yield of ammonia as a function of time in the reaction is given below
If this reaction is conducted at (P, T₂), with T₂ > T₁, the %yield of ammonia as a function of time is represented by