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[" 21.The half-life period of a first or...

[" 21.The half-life period of a first order reaction is "10" mirutes."],[" The time required for the concentration of the reactant to "],[" change from "0.08M" to "0.02M" is: "],[[" (a) "10" min "," (b) "20" min "(c)~ 30" min "," (d) "40" min "]]

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