Zero order reaction

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Zero order reaction:

The reaction in which the rate of the reaction is independent of the concentration of the reacting species is called a zero order reaction. Most of these reactions are heterogeneous in nature and take place on the surface of the crystalyst.

Example: 

(1)  photo chemical reaction between hydrogen and chlorine.

H²(g)+Cl²(g)--hv-->2HCl(g), rate = K[H²]°[Cl²]°

(2) Thermal decomposition of Hl on the surface of gold as catalyst
                 ∆
2NH³(g) -----> H²(g) +I²(g), rate 
                Au
= k[HI]°

(3) Thermal decomposition of NH³ on the surface of pt catalyst at high pressure.
                 ∆
2NH³(g) -----> N²(g), rate = k[NH³]° 
                Pt

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