Chemical KineticsEnergy Profile and Enthalpy Change41Choose the best answerIn an energy profile, the energy of products is E₂ and the energy of reactants is E₃. Which relation is correct?AA catalyst changes ΔH.BA catalyst changes the energies of reactants and products.CΔH = E₂ − E₃DA catalyst converts an endothermic reaction into an exothermic reaction. Like 0 Discuss 0Share
Chemical KineticsMolecularity of Elementary Reactions42Choose the best answerAn elementary reaction involving two different reactant species:ACan never be second orderBCannot be unimolecularCCannot be bimolecularDCannot have a rate law Like 0 Discuss 0Share
Chemical KineticsFirst-Order Reactions43Choose the best answerWhich of the following is commonly cited as an example of a first-order reaction?AH₂ + Cl₂ → 2HClBNH₄NO₂ → N₂ + 2H₂OC2HI → H₂ + I₂D2NO + Cl₂ → 2NOCl Like 0 Discuss 0Share
Chemical KineticsCollision Theory44Choose the best answerWhich statement is NOT true according to collision theory?AReacting particles must collide for a reaction to occur.BAll collisions form products.COnly effective collisions form products.DEffective collisions require sufficient energy and suitable orientation. Like 0 Discuss 0Share
Chemical KineticsReaction Order and Molecularity45Choose the best answerWhich statement about reaction order and molecularity is false?AReaction order may be zero, positive, negative or fractional.BMolecularity is a theoretical concept applied to an elementary step.CReaction order can never equal a stoichiometric coefficient.DMolecularity is a whole number. Like 0 Discuss 0Share