1.

The rate constant is numerically the same for three reactions of first, second and third order respectively. Which of the following is correct ?

Answer»

if [A]= 1 then `r_1 =r_2 = r_3`
if [A] lt 1 then `r_1 gt r_2 gt r_3`
if [A] gt 1 then `r_1 lt r_2 lt r_3`
all

SOLUTION :`r_1=k[A]` … (i) for 1st ORDER reaction.
`r_2=k[A]^2`…(ii) for 2nd order reaction.
`r_3=k[A]^3`…(iii) for 3rd order reaction.
When RATE constant k is the same for these reaction, it is clear that,
`r_1=r_2=r_3` when [A] = 1 mol `L^(-1)`
`r_1 gt r_2 gt r_3` When [A] `lt 1`
`r_1 lt r_2 lt r_3` When [A] `gt 1`.


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