Assertion : Protons carrying positive charges are compactly residing inside the nucleus.
Reason : Electrostatic repulsive force between protons is very weak.

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 but reason is false.
D. If both assertion and reason are false.

Explanation

To analyze the given assertion and reason, we can break down the problem step by step.

### Step 1: Understand the Assertion
The assertion states that protons, which carry positive charges, are compactly residing inside the nucleus. This is true because protons are indeed found in the nucleus of an atom.

**Hint:** Consider the structure of an atom and where protons are located.

### Step 2: Understand the Reason
The reason given is that the electrostatic repulsive force between protons is very weak. This statement is misleading. While it is true that the electrostatic repulsion exists between protons (since they are positively charged), the repulsive force is not weak compared to the forces that keep protons together in the nucleus.

**Hint:** Think about the forces acting within the nucleus and how they compare to electrostatic forces.

### Step 3: Identify the Forces at Play
In the nucleus, protons are held together by the strong nuclear force, which is significantly stronger than the electrostatic repulsive force between the protons. The strong nuclear force overcomes the repulsion caused by the positive charges of the protons, allowing them to stay compactly in the nucleus.

**Hint:** Recall the different types of forces acting at the atomic level and their relative strengths.

### Step 4: Conclusion
Both the assertion and the reason are true statements. However, the reason provided does not correctly explain why protons can reside compactly in the nucleus. The correct explanation involves the strong nuclear force being stronger than the electrostatic repulsion.

**Final Answer:**
- Assertion: True (Protons are compactly residing inside the nucleus).
- Reason: True (Electrostatic repulsive force exists, but it is not weak compared to the strong nuclear force).
- Conclusion: The assertion is true, and the reason is true, but the reason is not a correct explanation for the assertion.