The unit of the rate constant for first order reaction is

Options

A. `"mol"^(-1)`
B. `s^(-1)`
C. `s^(-1)"mol"^(-1)dm^(3)`
D. `"mol"^(-1)s^(-1)dm^(3)`

Answer

B

Explanation

(b)Unit of n th order rate constant=
`=(MoI LIt^(-1))^(1-n)s^(-1)`
when n=1,unity is
`s^(-1)`
`(a)" " t=(2.303)/(k)log"(a)/(a-x) "[thereforea=4,(a-x)=3
]`
`t=(2.303)/(k)log"(4)/(3)`