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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.
- a)Both A and R are true and R is correct explanation of A.
- b)Both A and R are true but R is not correct explanation of A.
- c)Both A and R are false.
- d)A is true but R is false.
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
In the following question, a statement of Assertion (A) followed by a ...
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
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
Most Upvoted Answer
In the following question, a statement of Assertion (A) followed by a ...
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.
Explanation:
- Let's first understand the dissociation process of PCl5. At a constant pressure and temperature, PCl5 partially dissociates into PCl3 and Cl2.
- The balanced chemical equation for this dissociation is:
PCl5 ⇌ PCl3 + Cl2
Assertion (A) explanation:
- When helium is added to the system at equilibrium, it does not participate in the chemical reaction. Helium is an inert gas and does not react with other substances under normal conditions.
- The addition of helium increases the total pressure of the system without affecting the partial pressures of PCl5, PCl3, and Cl2. According to Le Chatelier's principle, an increase in pressure will shift the equilibrium in the direction that reduces the total number of gas molecules.
- In the dissociation reaction, the number of gas molecules decreases when PCl5 is converted into PCl3 and Cl2. Therefore, the equilibrium will shift towards the products (right side) to reduce the total pressure.
- As a result, the dissociation of PCl5 increases when helium is added at equilibrium.
Reason (R) explanation:
- The reason states that helium removes Cl2 from the field of action. This means that the presence of helium reduces the concentration of Cl2 in the reaction mixture.
- Since helium does not react with any of the species involved in the dissociation of PCl5, it does not directly participate in the removal of Cl2.
- The removal of Cl2 is actually a result of the shift in equilibrium caused by the increase in pressure due to the addition of helium, as explained in the assertion.
- Helium does not selectively remove Cl2 from the reaction mixture; instead, it affects the equilibrium position by increasing the total pressure.
Conclusion:
- Both the assertion and the reason are true, but the reason is not the correct explanation of the assertion.
- The correct answer is option (B) - Both A and R are true, but R is not the correct explanation of A.
Reason (R): Helium removes Cl2 from the field of action.
Explanation:
- Let's first understand the dissociation process of PCl5. At a constant pressure and temperature, PCl5 partially dissociates into PCl3 and Cl2.
- The balanced chemical equation for this dissociation is:
PCl5 ⇌ PCl3 + Cl2
Assertion (A) explanation:
- When helium is added to the system at equilibrium, it does not participate in the chemical reaction. Helium is an inert gas and does not react with other substances under normal conditions.
- The addition of helium increases the total pressure of the system without affecting the partial pressures of PCl5, PCl3, and Cl2. According to Le Chatelier's principle, an increase in pressure will shift the equilibrium in the direction that reduces the total number of gas molecules.
- In the dissociation reaction, the number of gas molecules decreases when PCl5 is converted into PCl3 and Cl2. Therefore, the equilibrium will shift towards the products (right side) to reduce the total pressure.
- As a result, the dissociation of PCl5 increases when helium is added at equilibrium.
Reason (R) explanation:
- The reason states that helium removes Cl2 from the field of action. This means that the presence of helium reduces the concentration of Cl2 in the reaction mixture.
- Since helium does not react with any of the species involved in the dissociation of PCl5, it does not directly participate in the removal of Cl2.
- The removal of Cl2 is actually a result of the shift in equilibrium caused by the increase in pressure due to the addition of helium, as explained in the assertion.
- Helium does not selectively remove Cl2 from the reaction mixture; instead, it affects the equilibrium position by increasing the total pressure.
Conclusion:
- Both the assertion and the reason are true, but the reason is not the correct explanation of the assertion.
- The correct answer is option (B) - Both A and R are true, but R is not the correct explanation of A.
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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.a)Both A and R are true and R is correct explanation of A.b)Both A and R are true but R is not correct explanation of A.c)Both A and R are false.d)A is true but R is false.Correct answer is option 'D'. Can you explain this answer?
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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.a)Both A and R are true and R is correct explanation of A.b)Both A and R are true but R is not correct explanation of A.c)Both A and R are false.d)A is true but R is false.Correct answer is option 'D'. Can you explain this answer? for Class 11 2024 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about 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.a)Both A and R are true and R is correct explanation of A.b)Both A and R are true but R is not correct explanation of A.c)Both A and R are false.d)A is true but R is false.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 11 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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.a)Both A and R are true and R is correct explanation of A.b)Both A and R are true but R is not correct explanation of A.c)Both A and R are false.d)A is true but R is false.Correct answer is option 'D'. Can you explain this answer?.
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.a)Both A and R are true and R is correct explanation of A.b)Both A and R are true but R is not correct explanation of A.c)Both A and R are false.d)A is true but R is false.Correct answer is option 'D'. Can you explain this answer? for Class 11 2024 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about 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.a)Both A and R are true and R is correct explanation of A.b)Both A and R are true but R is not correct explanation of A.c)Both A and R are false.d)A is true but R is false.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 11 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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.a)Both A and R are true and R is correct explanation of A.b)Both A and R are true but R is not correct explanation of A.c)Both A and R are false.d)A is true but R is false.Correct answer is option 'D'. Can you explain this answer?.
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