**Assertion (A):** of and of have the same mass. <br>**Reason (R):** of any substance contains parti — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
**Assertion (A):** $1 \text{ mole}$ of $O_2$ and $1 \text{ mole}$ of $O_3$ have the same mass. <br>**Reason (R):** $1 \text{ mole}$ of any substance contains $N_A$ particles.
Answer: D
💡 Solution & Explanation
While the reason is a true definition of a mole, the masses are different: $O_2 = 32 \text{ g/mol}$ and $O_3 = 48 \text{ g/mol}$. Assertion is false; Reason is true.
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