The conc. of the solution that is initially 0.24M is reduced to 0.12M in 10 hours and 0.06 in 20 hours. What is the rate constant of the reaction?

zero order reaction as conc. is becoming half after a fixed interval of time with constant rate so put the values in formula of zero order ie k=concertration intial - final concerntration /time

it is in decreasing order 

let it goes upto nth term

so let time taken =10n (10,20,30....)in hour

and by g.p.

we cunclude that

10n=0.48*(1/2)^n

i think it is the answer you want 

please approove for me