Why does the velocity of gas molecules increase with increase in temperature ?

(A): The pressure of a gas depends upon kinetic energy of its molecules. (R) : Kinetic energy of gas molecules increases with increase in pressure.

(A): The resistivity of metals increases with increase in temperature. (R): The free electron density in metals in creases with increase in temperature.

(A): The resistivity of metals increases with increase in temperature (R): The average time of collision of electrons with the ion of lattice decreases with increase in temperature.

(A) : With increase in temperature the condicutivity of metals decreases. (R) : With increase in temperature lattice vibrations increase in metals.

Why does physisorption decrease with the increase of temperature ?

(A) Rate of constant of a reaction increases with increase in temperature (R ) Increase in temperature increases in the number of activated molecules

The population of activated molecules can be increased by A) increase in temperature B) using a catalyst C) increase of concentration of reactants