Question

For which of the following, the units of rate and rate constant of the reaction is identical?

• A. First order reaction
• B. Zero order reaction
• C. Second order reaction
• D. Fractional order reaction

Answer 1

Answer: (B)

Zero order reaction

Rate for a zero order reaction is given by

$Rate=\left(rateconstant\right)\times (conc.ofreactant)°$

For example let

$A+B\to C+D$

be a zero order reaction then

$\frac{-dA}{dt}=\frac{-dB}{dt}\Rightarrow K\left[A\right]°\left[B\right]°=K$

hence units of rate and rate constant is identical.