`90%` of the first order reaction is completed in 70 minutes. The velocity constant of the reaction is :
`90%` of the first order reaction is completed in 70 minutes. The velocity constant of the reaction is :
A. `0.0329`
B. `0.329`
C. `3.29`
D. `0.0293`
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`k=(2.303)/(t)log.(a)/(a-x)`
`k=(2.303)/(70)log.(100)/(100-90)`
`=0.0329 "min"^(-1)`
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