Question

# The unit of rate constant for a second order reaction is:

A
lit.sec
B
lit.mole.sec
C
mole1.lit.sec1
D
mole.sec

Solution

## The correct option is C $$mole^{-1}.lit.sec^{-1}$$Let the reaction be $$2\ A \rightarrow product$$$$Rate\ of\ reaction = k[A]^{2}.$$$$k= \dfrac{r}{[A]^{2}}$$$$=\dfrac{mole}{lit.sec}\ \times \dfrac{(lit)^{2}}{mole^{2}}$$$$\Rightarrow \dfrac{lit}{sec.mole}$$$$\Rightarrow mole^{-1} lit.\ sec^{-1}$$Option C is correct.Chemistry

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