In the following question, 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.

Options

A. Both A and Rare 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

Explanation

To solve the question regarding the assertion and reason about colloids, we will analyze both statements step by step.

### Step 1: Analyze the Assertion (A)
**Assertion (A): Colloids are stable.**

- Colloids are indeed stable systems. They consist of tiny particles that are dispersed throughout a medium. Common examples include milk, butter, and clouds.
- The stability of colloids means that the particles do not settle out of the dispersion medium over time, which is a key characteristic of colloidal systems.

**Conclusion for Step 1:** The assertion is true.

### Step 2: Analyze the Reason (R)
**Reason (R): Brownian movement has a stirring effect, which does not allow the particles to settle.**

- Brownian movement refers to the random motion of particles suspended in a fluid (liquid or gas) resulting from their collision with fast-moving molecules in the medium.
- This movement keeps the colloidal particles in constant motion, preventing them from settling under the influence of gravity.
- Therefore, the reason provided explains why colloids remain stable.

**Conclusion for Step 2:** The reason is also true and correctly explains the assertion.

### Step 3: Determine the Relationship Between A and R
- Both the assertion and the reason are true.
- The reason provides a valid explanation for the assertion.

### Final Conclusion:
Both Assertion (A) and Reason (R) are true, and the reason explains the assertion. Therefore, the correct choice is:
**Option 1: Both A and R are true, and R is the correct explanation of A.**

---