Question

Define Collison frequency.

Answer 1

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★$\bold{Collison\: frequency-:}$The number of collisions which take place in one second among the molecules present in 1 cc of the gas is called collision frequency. It is denoted by Z.

Answer 2

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Collision frequency is the average number of collisions between particles ( reactants) per unit time.

It is denoted by the symbol (z).