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

💡 Solution & Explanation

Statement I is correct because density $d = \frac{PM}{RT}$, so at constant temperature and for a fixed mass of gas, $d \propto P$. Doubling the pressure doubles the density. Statement II is incorrect because the molecular mass ($M$) of a specific gas is a fundamental constant for that gas and does not change with density or pressure. Therefore, correct answer is C.