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Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Colloids are stable.
Reason (R): Brownian movement has a stirring effect, which does not allow the particles to settle.
  • a)
    Both A and R are true and R is the correct explanation of A
  • b)
    Both A and R are true but R is NOT the correct explanation of A
  • c)
    A is true but R is false
  • d)
    A is false and R is True
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
Directions: In the following questions, A statement of Assertion (A) ...
Colloids are stable due to Brownian movement which is the movement of colloidal particles striking against the dispersion medium. It prevents them from settling down.
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Directions: In the following questions, A statement of Assertion (A) ...
Assertion (A): Colloids are stable.
Reason (R): Brownian movement has a stirring effect, which does not allow the particles to settle.

The correct answer is option 'A' - Both A and R are true and R is the correct explanation of A.

Explanation:
Colloids are a type of mixture where the particles are dispersed throughout a medium, but they do not dissolve or settle down. They have intermediate particle size between a solution and a suspension. The stability of colloids is a result of various factors, and one of the key factors is the Brownian movement.

Brownian movement:
Brownian movement is the random motion of particles suspended in a fluid. It is caused by the continuous collision between the particles and the molecules of the surrounding medium. This movement results in the dispersion and suspension of the particles, preventing them from settling down.

Stability of colloids:
The stability of colloids is primarily due to the Brownian movement. The continuous collisions between the particles and the molecules of the medium keep the particles in a state of constant motion. This motion prevents the particles from settling down, ensuring the stability of the colloidal system.

Explanation of the reason (R):
The reason mentioned in statement R is correct. Brownian movement indeed has a stirring effect on the particles, which does not allow them to settle. The random motion of the particles caused by the collisions with the surrounding molecules keeps them dispersed and suspended in the medium.

Explanation of the assertion (A):
The assertion mentioned in statement A is also true. Colloids are indeed stable due to the continuous Brownian movement. The stirring effect of the Brownian movement counteracts the gravitational force acting on the particles, preventing them from settling.

Conclusion:
In conclusion, both the assertion and reason are true, and the reason correctly explains why colloids are stable. The continuous Brownian movement caused by the collisions between particles and the molecules of the medium keeps the colloidal particles dispersed and prevents them from settling down.
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Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Colloids are stable.Reason (R): Brownian movement has a stirring effect, which does not allow the particles to settle.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'A'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Colloids are stable.Reason (R): Brownian movement has a stirring effect, which does not allow the particles to settle.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Colloids are stable.Reason (R): Brownian movement has a stirring effect, which does not allow the particles to settle.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'A'. Can you explain this answer?.
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