Which of the following would not cause an increase in the pressure inside a sealed container of neon gas?

The pressure in a sealed container means the volume of container is fixed

so we cannot change the volume of container hence gas

The other factors which can affect the pressure are

a) moles of gas : if we increase the moles of gas the pressure of gas will increase

b) Temperature: if we increase the pressure of gas the pressure of gas will increase due to increase in kinetic energy

So the following cannot increase pressure

a) decrease in moles of gas

b) decrease in temperature of gas

Hey there! Your answer is C. Increasing the volume of the container

This is because the container is already sealed, so the volume is fixed.