Chemical KineticsCatalysis41Choose the best answerWhich statement is NOT necessarily true about a catalyst?AIt cannot make a thermodynamically non-spontaneous reaction spontaneous.BIt is regenerated overall after the reaction.CIt does not change the enthalpy change of reaction.DIt must remain in exactly the same physical state throughout the reaction. Like 0 Discuss 0Share
Chemical KineticsOverall Order of Reaction42Choose the best answerFor the rate law Rate = k[A]¹ᐟ²[B]³ᐟ², the overall order of reaction is:A1.5B2C3D1 Like 0 Discuss 0Share
Chemical KineticsPseudo-First-Order Reactions43Choose the best answerUnder usual acid-catalysed conditions, inversion of sucrose behaves as a:AZero-order reactionBPseudo-first-order reactionCSecond-order reactionDThird-order reaction Like 0 Discuss 0Share
Chemical KineticsNature of Reaction and Reaction Rate44Choose the best answerWhich type of reaction is generally slower than rapid ionic reactions such as neutralization and double displacement?ANeutralizationBRedox reactionCDouble displacementDAll are always equally fast Like 0 Discuss 0Share
Chemical KineticsRate Law from Reaction Mechanism45Choose the best answerConsider the mechanism: Step 1: 2NO ⇌ N₂O₂ (fast equilibrium) Step 2: N₂O₂ + H₂ → N₂O + H₂O (slow) Step 3: N₂O + H₂ → N₂ + H₂O (fast) The overall rate law is:ARate = k[NO]²[H₂]BRate = k[N₂O₂][H₂]CRate = k[NO]²DRate = k[N₂O₂][H₂]² Like 0 Discuss 0Share