Question

The order of reaction is an experimentally determined quantity. It may be zero, positive, negative, or fractional. The kinetic equation of b$n$th order reaction is
$k\times t=\frac{1}{n-1}[\frac{1}{(a-x{)}^{n-1}}-\frac{1}{a^{n-1}}]$
Half life of $n$th order reaction depends on the initial concentration according to the following relation :
Unit of $k={\left[\frac{1}{Cone}\right]}^{n-1}\times Tim{e}^{-1}$
The differential rate law for $n$th order reaction may be given as :
$\frac{dx}{dt}=k[A{]}^n$
where A denotes the reactant.The unit of rate and rate constant are same for:

• A. Zero order reation
• B. First order reaction
• C. Second order reaction
• D. Half order reaction

Answer 1

The correct option is A Zero order reation

For zero order reaction
$\frac{dx}{dt}=k[A{]}^0=k$
$\therefore$ Unit of rate = mol $L^{-1}tim{e}^{-1}$
Unit of rate constant = mol $L^{-1}tim{e}^{-1}$