Read the Assertion and Reason below and choose the correct option. — States of Matter and Gaseous State Chemistry Question

💡 Solution & Explanation

Statement II is correct; average kinetic energy depends only on absolute temperature ($KE = \frac{3}{2}RT$). Statement I is correct. Since $KE = \frac{1}{2} M v_{rms}^2$ is constant for all gases at a given T, a larger molar mass $M$ necessitates a smaller speed $v$ to keep the product constant. Thus, II correctly explains I. Therefore, correct answer is A.