Question

Example of zero order reaction.

Answer 1

Zero order reaction means that the rate of reaction is a constant and is independent of the concentration of the reactants.

[A ] + [B] ===>  [C] + [D]

[C] = k  [A]^0 [B]^0  = k
[A] =  [A]_0   - k t             t = time ,  [A]_0 = initial concentration.

So the concentration of the reactants decreases linearly and the concentration of the products increases linearly.  This usually happens in presence of catalysts and in presence of sufficient quantities of the reactants.

Examples:   
1 .   Dissociation of  Ammonia at high temperature in presence of Platinum catalyst.
          3 NH3   ==>  N2 + 3 H2 
2.   Dissociation of NO  at very high temperature over Platinum surface
          2 NO ==> N2 + O2