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

💡 Solution & Explanation

Statement I is incorrect. As temperature increases, the Maxwell-Boltzmann distribution curve flattens out and becomes broader, so the peak height (the fraction of molecules at the most probable speed) decreases. Statement II is correct, as $u_{mp} = \sqrt{2RT/M}$, which increases with temperature. Therefore, correct answer is D.