Which of the following does not change during compression of a gas at constant temperature? — States of Matter and Gaseous State Chemistry Question

💡 Solution & Explanation

During isothermal compression, the temperature is constant. Since the average speed of ideal gas molecules depends exclusively on absolute temperature ($v \propto \sqrt{T}$), it remains unchanged. The volume decreases, so density increases, molecular distance decreases, and collision frequency increases. Therefore, correct answer is C.