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[" In a first order reaction the concent...

[" In a first order reaction the concentration of reactant "],[" decreases from "800mol/dm^(3)" to "50mol/dm^(3)" in "],[2times10^(4)" sec.The rate constant of reaction in "sec^(-1)" is "],[[" (a) "2times10^(4)," (b) "3.45times10^(-5)],[" (c) "1.386times10^(-4)," (d) "2times10^(-4)]]

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