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In a first order reaction, the concentra...

In a first order reaction, the concentration of the reactant decreases form `800 "mol dm"^(-3)` to `50 "mol dm"^(-3)` in `2 xx 10^(4) s`. The rate constant of the reaction (in `s^(-1)`) is

A

(a) `2xx10^(4)`

B

(b) `3.45xx10^(-5)`

C

(c ) `1.386xx10^(-4)`

D

(d) `2xx10^(-4)`

Text Solution

Verified by Experts

The correct Answer is:
c
`K=2.303/t"log"C_(0)/C`
`=2.303/(2xx10^(4))"log"800/50`
`=1.38xx10^(-4) sec^(-1)`
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