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The correct difference between first and second order reactions is thatA. a first-order reaction can be catalysed , a second-order reaction cannot be catalysedB. the half-life of a first-order reaction does not depend on `[A]_(0)`, the half-life of a second-order reaction does depend on `[A]_(0)`C. the rate of a first-order reaction does not depend on reactant concentrations, the rate of a second-order reaction does depend on reactant concentrationsD. the rate of a first-order reaction does depend on reactant concentrations, the rate of a second-order reaction does not depend on reactant concentrations |
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Answer» Correct Answer - B For first order reactions, the rate of reaction is proportional to the first power of the concentration of the first power of the concentration of the reactant. For, `A to B` Rate`=-(d[A])/(dt)=k[A] " " ["where,k=constant"]` Half-life `(t_(1//2)=(0.693)/(k))` `therefore` Rate of first order reaction depends upon reactant concentrations and half life does not depend upon initial concentration of reactant, `[A]_(0)`. For second order reactions, the rate of reaction is proportional to the second power of the concentration of the reactant. For, `2A to B` Rate `=k[A]^(2)` Half-life`(t_(1//2)=(1)/(k[A]_(0)))` `therefore` Rate of second order reaction depends upon reactant concentration and half life also does depend on `[A]_(0)`. |
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