Chemical KineticsEffect of Temperature on Reaction Rate1Choose the best answerThe large increase in reaction rate with increasing temperature is mainly because:ACollision frequency decreases.BThe fraction of molecules with energy equal to or greater than Ea increases.CMean free path decreases only.DActivation energy decreases. Like 0 Discuss 0Share
Chemical KineticsEffect of Catalyst on Activation Energy2Choose the best answerA reaction is catalysed by X. The primary kinetic effect of X is that it:ADecreases the rate constantBIncreases the equilibrium constantCDecreases the enthalpy changeDLowers the activation energy Like 0 Discuss 0Share
Chemical KineticsUnits of Rate Constant and Reaction Order3Choose the best answerThe rate constant has units s⁻¹. What is the order of the reaction?AZeroBFirstCSecondDFractional Like 0 Discuss 0Share
Chemical KineticsAverage Rate of Reaction4Choose the best answerThe concentration of a reactant decreases from 0.20 mol dm⁻³ to 0.10 mol dm⁻³ in 10 min. Its average rate of disappearance is:A0.01 MB2 × 10⁻² mol dm⁻³ min⁻¹C0.01 mol dm⁻³ min⁻¹D1 mol dm⁻³ min⁻¹ Like 0 Discuss 0Share
Chemical KineticsRate of Reaction and Stoichiometric Coefficients5Choose the best answerFor the reaction 3A + B → C + D, the rate of reaction is:A−(1/3)d[A]/dt = −d[B]/dt = d[C]/dt = d[D]/dtB−d[A]/dt = −d[B]/dt = d[C]/dtC+(1/3)d[A]/dt = d[C]/dtD−d[A]/dt = −d[B]/dt = d[C]/dt = d[D]/dt Like 0 Discuss 0Share