**Assertion (A):** Molarity of a solution changes with temperature. <br>**Reason (R):** Volume of a — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question

💡 Solution & Explanation

Molarity ($M$) is defined as $\text{moles of solute} / \text{Volume of solution (L)}$. Since volume expands or contracts with temperature changes ($V \propto T$), the molarity (which is inversely proportional to volume) will change accordingly. [1, 3]