Increasing the number of molecules will decrease the pressure of a gas in a closed container. Hence, option A is correct.
What is pressure?
Pressure, in the physical sciences, the perpendicular force per unit area, or the stress at a point within a confined fluid.
An increase in the number of gas particles in the container increases the
frequency of collisions with the walls and therefore the pressure of the gas.
If the temperature decreases the pressure will also decrease.
Temperature is a measure of kinetic energy. When the temperature inside the container decreases the kinetic energy will also decrease.
Hence, option A is correct.
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