When the temperature of a gas is decreased the kinetic energy of molecules __ a None of the above b Increases c Remains the same d Decreases

The correct answer is:<br /><br />**d) Decreases**<br /><br />### Explanation:<br />The kinetic energy of gas molecules is directly proportional to the temperature of the gas. When the temperature decreases, the average kinetic energy of the gas molecules also decreases because temperature is a measure of the average kinetic energy of the particles in a substance. <br /><br />This relationship is described by the **Kinetic Molecular Theory** and can be mathematically expressed as:<br /><br />\[<br />KE \propto T<br />\]<br /><br />Where:<br />- \( KE \) = Kinetic Energy<br />- \( T \) = Temperature (in Kelvin)<br /><br />Thus, when the temperature decreases, the motion of the gas molecules slows down, leading to a decrease in their kinetic energy.