Question

If the rate constant of a reaction has the value $k=163 \times 10^{-4}( mol )^{-\frac{1}{2}} s ^{-1}$, the order of the reaction is

• A. one
• B. two
• C. zero
• D. None of these

Answer 1

Answer: (D)

None of these

Answer 2

Rate constant, $k=1.63 \times 10^{-4}( mol )^{-1 / 2} s ^{-1}$
For nth order reaction, $k=\frac{\text { Rate }}{(\text { conc })^{n}} \frac{\text { Conc. }}{\text { time }} \times \frac{1}{(\text { Conc })^{n}}$
$Sl$ units of concentration is $mol L^{-1}$ and time is $s$.
Therefore, the units of $k= mol ^{-1 / 2} s ^{-1}$ cannot be possible.