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; vapor pressure is constant at a constant temperature regardless of volume. Because the pressure is constant in both containers, the number of moles of vapour is directly proportional to the volume ($n \propto V$). Total kinetic energy is proportional to the number of moles ($KE = \frac{3}{2}nRT$). Thus, $KE \propto V$, making the ratio 1:2. Statement II is the reason why the pressure is identical, explaining Statement I. Therefore, correct answer is A.