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Assertion & Reason Test: Equilibrium - NEET MCQ


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10 Questions MCQ Test Chemistry Class 11 - Assertion & Reason Test: Equilibrium

Assertion & Reason Test: Equilibrium for NEET 2024 is part of Chemistry Class 11 preparation. The Assertion & Reason Test: Equilibrium questions and answers have been prepared according to the NEET exam syllabus.The Assertion & Reason Test: Equilibrium MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: Equilibrium below.
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Assertion & Reason Test: Equilibrium - Question 1

In the following question, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): Increasing order of acidity of hydrogen halides is HF < HCI < HBr < HI

Reason (R): While comparing acids formed by the elements belonging to the same group of periodic table. H-A bond strength is a more important factor in determining acidity of an acid than the polar nature of the bond.

Detailed Solution for Assertion & Reason Test: Equilibrium - Question 1

The bond strength of an acid generally depends on the size of the ′A′ atom: the smaller the ′A′ atom, the stronger the H−A bond. When going down a row in the Periodic Table, the atoms get larger so the strength of the bonds get weaker, which means the acids get stronger.
While comparing acids formed by the elements belonging to the same group of periodic table, ′A′ bond strength is a more important factor in determining acidity of an acid than the polar nature of the bond.
So, the correct option is A) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Assertion & Reason Test: Equilibrium - Question 2

In the following question, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): The ionization of hydrogen sulphide in water is low in the presence of hydrochloric acid.

Reason (R): Hydrogen sulphide is a weak acid.

Detailed Solution for Assertion & Reason Test: Equilibrium - Question 2

Correct explanation. HCl gives the common H+ ions and hence ionization equilibrium H2S⇔2H++S2− is suppressed.

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Assertion & Reason Test: Equilibrium - Question 3

In the following question, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A) : Aqueous solution of ammonium carbonate is basic.

Reason (R) : Acidic/basic nature of a salt solution of a salt of weak acid and weak base depends on Ka and Kb value of the acid and the base forming it.

Detailed Solution for Assertion & Reason Test: Equilibrium - Question 3

The correct option is A
Both A and R are true and R is the correct explanation of A.
Analyzing the assertion
It is correct because aqueous solution of ammonium carbonate is basic in nature.
Analyzing the reason
It is also correct because for a solution of salt of weak acid and weak base, the acidic/basic nature depends upon value of Ka for weak acid and Kb for weak base.
Solution is basic if
Kb (weak base) >Ka (weak acid).
Ka(H2CO3)=4.3×10−7
Kb(NH4OH)=1.8×10−5
Kb (Ammonium hydroxide) >Ka (Hydrogen carbonate)
∴ Hence, solution of Ammonium carbonate is basic in nature.
Both A and R are true and R is the correct explanation of A.
∴ Correct answer is option (A).

Assertion & Reason Test: Equilibrium - Question 4

In the following question, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A) : In the dissociation of PCl5 at constant pressure and temperature, addition of helium at equilibrium increases the dissociation of PCl5.

Reason (R) : Helium removes Cl2 from the field of action.

Detailed Solution for Assertion & Reason Test: Equilibrium - Question 4

Analyzing the assertion

It is false.

PCl5(g)⇌PCl3(g)+Cl2(g)

When an inert gas (He) is added to the system in equilibrium at constant pressure, then the total volume will increase. Hence, the number of moles per unit volume of various reactants and products will decrease.

Hence, the equilibrium will shift towards the direction in which there is increase in number of moles of gases. i.e. forward direction. So, it will facilitate or increase the dissociation of PCl5. and statement given in assertion is correct.

Analyzing the reason

Helium removes Cl2 from the field of action.

It is false statement. Helium does not react withCl2, therefore it cannot remove Cl2 from the reaction mixture.

A is true, R is false

Assertion & Reason Test: Equilibrium - Question 5

In the following question, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): A solution containing a mixture of acetic acid and sodium acetate maintains a constant value of pH on addition of small amounts of acid or alkali.

Reason (R) : A solution containing a mixture of acetic acid and sodium acetate acts as a buffer solution around pH 4.75.

Detailed Solution for Assertion & Reason Test: Equilibrium - Question 5

The correct option is A
Both A and R are true and R is the correct explanation of A.
Analyzing the assertion
Given solution of CH3COOH and CH3COONa maintain constant value of pH on addition of small amount of acid or alkali. Yes, it is correct statement
Analyzing the reason
Since, it is an acidic buffer, because it is prepared from weak acid (i.e. acetic acid) and its salt with strong base (i.e. Sodium Acetate).
Buffer solution resists change in pH value.
Since this is acidic buffer,.
So, the buffer range will be observed at pH of around
pH≈pKa (pKa=4.75,for acetic acid)
So, the statement given in reason is correct and it explain the assertion too. Hence,
∴ Both assertion and reason are true and reason is the correct explanation of assertion.
Therefore, correct answer is option (A).

Assertion & Reason Test: Equilibrium - Question 6

In the following question, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A) : For any chemical reaction at a particular temperature, the equilibrium constant is fixed and is a characteristic property.

Reason (R) : Equilibrium constant is independent of temperature.

Detailed Solution for Assertion & Reason Test: Equilibrium - Question 6

The correct option is C
A is true but R is false.
Analyzing the assertion
For any chemical reaction at a particular temperature the equilibrium constant is fixed and is a characteristic property
It is correct, because for a given chemical reaction its equilibrium constant K does have fixed value at constant temperature, which is characteristic property because it gives information about the extent of reaction at equilibrium.
Analyzing the reason
Equilibrium constant is independent of temperature.
It is incorrect, because the value of equilibrium constant (K) is temperature dependent and its value is different at different temperatures for a same chemical reaction.
Equilibrium constant is the ratio of rate constants of forward and backward reaction. Since, rate constant depends upon temperature (as per Arrhenius equation, k=Ae−Ea/RT). So, equilibrium constant will also depend on temperature.
Assertion is correct, but Reason is incorrect (false)
∴ So, Correct option is (C).

Assertion & Reason Test: Equilibrium - Question 7

In the following question, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): An aqueous solution of ammonium acetate can act as a buffer.

Reason (R) : Acetic acid is a weak acid and NH4OH is a weak base.

Detailed Solution for Assertion & Reason Test: Equilibrium - Question 7

Analyzing the Assertion and Reason:
Assertion : It is true because solution of ammonium acetate is salt solution giving NH+4 and CH3COO ions which can react with both Hand OH− from strong acid or base in a small amount to form weak acid or base so will resist the change in pH, so it is a buffer solution.

Reason : It is not because CH3COOH is weak acid and NH4OH is a weak base as explained above.
Hence A is false but R is true.

Assertion & Reason Test: Equilibrium - Question 8

Match the following equilibria with the corresponding condition:

Detailed Solution for Assertion & Reason Test: Equilibrium - Question 8
(i) Liquid ⇌ Vapour equilibrium exists at the boiling point.

(ii) Solid ⇌ Liquid equilibrium exists at the melting point.

(iii) Solid ⇌ Vapour equilibrium exists at the sublimation point.

(iv) Solute(s) ⇌ Solute (solution) equilibrium exists in saturated solution.

Assertion & Reason Test: Equilibrium - Question 9

Match Column (I) and Column (II).

Detailed Solution for Assertion & Reason Test: Equilibrium - Question 9
(i) When reaction is in equilibrium, ΔGo = 0. Hence, (i)-(c).

(ii) For spontaneous reaction, ΔG < 0(−ve), K > 1. Hence (ii)-(d).

(iii) For non-spontaneous reaction, ΔG > 0(+ve), K < 1. Hence (iii) - (a).

Assertion & Reason Test: Equilibrium - Question 10

Match the following graphical variation with their description.

Detailed Solution for Assertion & Reason Test: Equilibrium - Question 10
  • According to Le chatelier's principle as the time passes accumulation of products occur and depletion of reactant i.e. reaction will proceed in the forward direction.

  • According to Le chatelier's principle as time passes accumulation of reactant occurs and depletion of product i.e. the reaction will proceed in the backward direction.

  • According to Le chatelier's principle as time passes equal attainment of reactant and product occurs and chemical Equilibrium is obtained. It can be obtained from either direction.

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