Question

For a reaction , the following graphs are obtained between rate of reaction and concentration of reactant :



The order of reaction is

• A. zero
• B. first
• C. second
• D. third

Answer 1

The correct option is C second

For a $n^{th}$ order reaction , rate (R):
$R=k[A{]}^n$
For
$n=2$
$R=k[A{]}^2...(I)$
The graph between rate of reaction and concentration is of the type :
$y=m{x}^2$, i.e. a parabola
Also, from equation $I$:
Graph between rate of reaction and ${\text{(Concentration)}}^2$ is of the type $y=mx$ i.e. a straight line passing through origin.
Hence the order of the reaction is 2.