Assertion (A) : NaCl and MgO have coulombic forces of attraction between them.
Reason (R): Each point in a lattice is called lattice point or lattice site.

Options

A. Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
B. Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
C. Assertion (A) is correct, but Reason (R) is incorrect statement.
D. Assertion (A) is incorrect, but Reason (R) is correct statement.

Answer

To solve the question, we need to analyze both the assertion (A) and the reason (R) provided.

### Step 1: Analyze the Assertion (A)
The assertion states that NaCl (sodium chloride) and MgO (magnesium oxide) have coulombic forces of attraction between them.

- **Explanation**: NaCl is an ionic compound formed from Na⁺ and Cl⁻ ions, while MgO is formed from Mg²⁺ and O²⁻ ions. Ionic compounds are characterized by the electrostatic attraction between positively and negatively charged ions, which is indeed a coulombic force. Therefore, the assertion is **true**.

### Step 2: Analyze the Reason (R)
The reason states that each point in a lattice is called a lattice point or lattice site.

- **Explanation**: In crystallography, a lattice point refers to the position in a crystal lattice where an atom, ion, or molecule is located. This definition is correct and is a fundamental concept in solid-state chemistry. Therefore, the reason is also **true**.

### Step 3: Determine the Relationship Between Assertion and Reason
Now we need to determine if the reason correctly explains the assertion.

- **Explanation**: While both the assertion and reason are true, the reason does not explain the assertion. The assertion discusses the coulombic forces of attraction in ionic compounds, while the reason describes what a lattice point is. There is no direct connection between the two statements.

### Conclusion
- **Assertion (A)**: True
- **Reason (R)**: True
- **Relationship**: The reason does not explain the assertion.

### Final Answer
The correct answer is that both the assertion and the reason are true, but the reason does not explain the assertion.

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