Read the Assertion and Reason below and choose the correct option. — Chemical Equilibrium Chemistry Question

💡 Solution & Explanation

NO₂ is a brown-colored gas, whereas N₂O₄ is colorless. As the reaction proceeds, the color intensity changes based on the concentration of NO₂. When equilibrium is established, the concentrations of both gases become constant, meaning the intensity of the brown color remains stable. Statement II provides the physical property that explains the visual observation described in Statement I. Therefore, correct answer is A.