What will happen if the pressure of the system is raised to 1.5 atmospheres and the temperature remains same? The piston will move upwards because the number of moles of the gas particles will increase.
The piston will move downwards because the gas particles will occupy less volume than before.
The piston will move upwards because the gas particles will hit the walls of the container with increased force.
The piston will move downwards because the gas particles will start moving randomly in all directions, pulling the piston down.