Chemical KineticsReaction Mechanism and Intermediates46Choose the best answerFor the mechanism: Step 1: 2NO₂ → NO₃ + NO Step 2: NO₃ + CO → NO₂ + CO₂ Which species acts as an intermediate?ANO₂BNO₃CCODCO₂ Like 0 Discuss 0Share
Chemical KineticsArrhenius Equation and Frequency Factor47Choose the best answerIn the Arrhenius equation k = Ae⁻ᴱᵃ⁄ᴿᵀ, the pre-exponential factor A depends on:ANature of reacting moleculesBMolecular structure and orientationCCollision frequencyDAll of the above Like 0 Discuss 0Share
Chemical KineticsOrder of Reaction48Choose the best answerFor a first-order reaction, which quantity remains constant during the reaction?AHalf-lifeBConcentration of reactantCRate of reactionDAmount of product formed Like 1 Discuss 0Share
Chemical KineticsThreshold Energy49Choose the best answerThe minimum total energy that colliding molecules must possess for an effective collision is called:AInternal energyBActivation energyCThreshold energyDHeat of reaction Like 0 Discuss 0Share
Chemical KineticsForward and Reverse Activation Energies50Choose the best answerIf Ef and Er are the activation energies of the forward and reverse reactions, respectively, and the forward reaction is exothermic:AEf > ErBEf < ErCEf = ErDNo relationship exists Like 0 Discuss 0Share