Assertion : Atomicity of `O_(3)` is 3.
Reason : 1 mole of an element contains `6.023 xx 10^(23)` atoms.

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.

Answer

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

**Step 1: Understanding the Assertion**
- The assertion states that the atomicity of O₃ (ozone) is 3.
- Atomicity refers to the number of atoms present in a molecule of a substance.
- In the case of O₃, there are three oxygen atoms bonded together, which confirms that the atomicity is indeed 3.

**Step 2: Understanding the Reason**
- The reason states that 1 mole of an element contains 6.023 x 10²³ atoms, which is known as Avogadro's number.
- This statement is true as it defines the quantity of atoms in one mole of any substance.

**Step 3: Analyzing the Relationship**
- While both the assertion and the reason are correct statements, the reason does not explain why the atomicity of O₃ is 3.
- The atomicity of a molecule is determined by the number of atoms in that specific molecule, not by the concept of moles or Avogadro's number.

**Conclusion**
- Therefore, the assertion is correct, and the reason is also correct, but the reason does not provide the correct explanation for the assertion.

Thus, the final answer is that both statements are correct, but the reason is not the correct explanation for the assertion.