Assertion : One mole of `SO_(2)` contains double the number of molecules present in one mole of `O_(2)`
Reason : Molecular weight of `SO_(2)` is double to that of `O_(2)`.

Options

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

Explanation

To solve the given assertion and reason question, we need to analyze both the assertion and the reason step by step.

### Step 1: Analyze the Assertion
The assertion states that "One mole of SO₂ contains double the number of molecules present in one mole of O₂."

- According to Avogadro's law, one mole of any substance contains the same number of molecules, which is approximately \(6.022 \times 10^{23}\) molecules (Avogadro's number).
- Therefore, one mole of SO₂ contains \(6.022 \times 10^{23}\) molecules, and one mole of O₂ also contains \(6.022 \times 10^{23}\) molecules.
- Since both contain the same number of molecules, the assertion is **false**.

### Step 2: Analyze the Reason
The reason states that "The molecular weight of SO₂ is double that of O₂."

- The molecular weight of SO₂ can be calculated as follows:
- Sulfur (S) has an atomic weight of approximately 32 g/mol.
- Oxygen (O) has an atomic weight of approximately 16 g/mol.
- Therefore, the molecular weight of SO₂ = 32 (for S) + 2 × 16 (for 2 O) = 32 + 32 = 64 g/mol.

- The molecular weight of O₂ = 2 × 16 = 32 g/mol.
- Since 64 g/mol (for SO₂) is indeed double 32 g/mol (for O₂), the reason is **true**.

### Conclusion
- The assertion is **false**, and the reason is **true**. Therefore, the correct answer is that the assertion does not support the reason.

### Final Answer
Assertion is false, Reason is true.