Final answer:
The partial pressure of each gas in a mixture of gases is proportional to the mole fraction of the gas. Hence the correct answer is option D
Step-by-step explanation:
The partial pressure of each gas in a mixture of gases is proportional to the mole fraction of the gas. According to Dalton's law, the partial pressure of a gas A is equal to the mole fraction of A multiplied by the total pressure of the gas mixture. In other words, the more moles of a gas are present in a mixture, the higher the partial pressure of that gas.
Hence the correct answer is option D