Statement-1 : Li and Mg show diagonal relationship.
Statement-2 : Li and Mg have nearly same atomic radius.

Options

A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1
B. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1
C. Statement-1 is True, Statement-2 is False
D. Statement-1 is False, Statement-2 is True

Answer

To analyze the given statements regarding lithium (Li) and magnesium (Mg), we will break down the information step by step.

### Step 1: Understanding Diagonal Relationship
- **Statement 1**: "Li and Mg show diagonal relationship."
- The diagonal relationship in the periodic table refers to the similarities between elements that are positioned diagonally to each other. In this case, lithium (Li) from period 2 and magnesium (Mg) from period 3 exhibit similar chemical properties due to their positioning in the periodic table.
- **Conclusion**: Statement 1 is true.

### Step 2: Comparing Atomic Radii
- **Statement 2**: "Li and Mg have nearly the same atomic radius."
- The atomic radius of lithium is approximately 1.52 Å (angstroms), while that of magnesium is about 1.60 Å. The difference in their atomic radii is relatively small, indicating that they have comparable sizes.
- **Conclusion**: Statement 2 is also true.

### Step 3: Evaluating the Relationship Between the Statements
- Now we need to determine if Statement 2 provides a correct explanation for Statement 1.
- While both statements are true, the similarity in atomic radii does not solely account for the diagonal relationship. The diagonal relationship arises from a combination of factors, including charge density and electronegativity, rather than just atomic size.
- **Conclusion**: Statement 2 is not a correct explanation for Statement 1.

### Final Evaluation of Options
- Based on our analysis:
- Statement 1 is true.
- Statement 2 is true.
- Statement 2 is not a correct explanation for Statement 1.
- Therefore, the correct option is: "Statement 1 is true, Statement 2 is true, and Statement 2 is not a correct explanation for Statement 1."

### Final Answer
The correct answer is Option 2: Statement 1 is true, Statement 2 is true, but Statement 2 is not a correct explanation for Statement 1.

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