Assertion : Atomicity of oxygen is 2.
Reason : 1 mole of an element contains `6.023xx10^(23)` atoms.

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 the assertion and reason both are false.

Explanation

To solve the question, we need to analyze the assertion and the reason provided.

**Step 1: Understanding the Assertion**
- The assertion states that "Atomicity of oxygen is 2."
- Atomicity refers to the number of atoms present in a molecule of a substance.
- Oxygen exists as a diatomic molecule (O₂), meaning each molecule of oxygen is made up of 2 oxygen atoms. Therefore, the assertion is correct.

**Step 2: Understanding the Reason**
- The reason states that "1 mole of an element contains `6.023 x 10^(23)` atoms."
- This statement is true as it refers to Avogadro's number, which indicates that 1 mole of any substance contains approximately `6.022 x 10^(23)` entities (atoms, molecules, etc.).
- However, this reason does not explain why the atomicity of oxygen is 2. It simply states a fact about moles and does not relate directly to the assertion regarding the atomicity of oxygen.

**Step 3: Conclusion**
- The assertion is true (the atomicity of oxygen is indeed 2), but the reason provided does not correctly explain the assertion. Therefore, we conclude that the assertion is true, but the reason is false.

**Final Answer:**
- Assertion: True
- Reason: False