(i) Zero order Reaction:

Mathematical expression for first order reaction :

Rate of reaction is independent of concentration. Where c ≠ O

Unit of Rate Constant: mol. litre-1 time-1


(ii) First Order Reaction:

Mathematical  expression for first order reaction :

(iii) Pseudo First Order Reaction:

When the order of reaction seems like 2 but one component in large excess then     it behaves like first order, such type of reaction, are called as pseudo first order reaction.


when water is taken an solvent i.e. in excess.

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