Assertion :The contact angle between water and glass is acute.
Reason :The surface of water in the capillary is convex .

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true and reason is false.
D. If both assertion and reason are false.

Explanation

To analyze the given assertion and reason, we will break down the concepts involved step by step.

### Step 1: Understanding the Assertion
The assertion states that "The contact angle between water and glass is acute."

- The contact angle is defined as the angle formed between the tangent to the liquid surface and the solid surface at the point of contact.
- For water in contact with glass, the contact angle is typically very small (close to 0 degrees), indicating that water wets the glass surface well. Therefore, the assertion is true because a contact angle of 0 degrees is considered acute.

### Step 2: Understanding the Reason
The reason states that "The surface of water in the capillary is convex."

- In a capillary tube, when water is in contact with glass, it tends to rise due to adhesion between the water molecules and the glass molecules, which creates a concave meniscus (not convex).
- A convex surface would indicate that the liquid is not wetting the surface well, which is not the case for water and glass. Therefore, the reason is false.

### Step 3: Conclusion
Since the assertion is true and the reason is false, we can conclude that the correct relationship between the two statements is that the assertion is correct, but the reason provided is incorrect.

### Final Answer
- The assertion is true, and the reason is false.