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Q. The rates of a certain reaction $\left(dc/dt\right)$ at different times are as follows
Time $Rate\left(mole litre^{-1}sec^{-1}\right)$
0 $2.8\times10^{-2}$
10 $2.78\times10^{-2}$
20 $2.81\times10^{-2}$
30 $2.79\times10^{-2}$

The reaction is

Chemical Kinetics

Solution:

The concentration of reactant does not change with time for zero order reaction (unit of K suggests zero order) since reactant is in excess.