Chemical Kinetics

Arrhenius equation is

• k = Ae^Ea/RT

• k = Ae^-Ea/RT

• k = Ae^RT/Ea

• k = Ae^-RT/Ea

If we plot log k Vs 1/T, by Arrhenius equation, the slope is

• -Ea/R

• +Ea/R

• -Ea/2.303R

• +Ea/2.303R

A catalyst increases the rate of a chemical reaction by

• increasing the activation energy

• decreasing the activation energy

• reacting with reactants

• reacting with products

If the rate of the reaction is equal to the rate constant, then the order of the reaction is

• 3

• 0

• 1

• 2

The time of half change of a first order reaction is _______initial concentration.

• proportional to

• inversely proportional to

• independent of

• equal to

The unit of rate and rate constant are same for ______order reaction

• zero

• one

• two

• three

For an elementary reaction 2A + B →C + D, the molecularity is

• zero

• one

• two

• three

The rate law of the reaction 2N₂O₅ → 2NO₂ + O₂ is

• r = k[N₂O₅ ]

• r = k[N₂O₅ ]²

• r = k[N₂O₅ ]0

• r = k[NO₂]⁴ [O₂]

Which of the following are true of reaction rates?

I. The overall rate law is determined by the fastest step of a reaction

II. The presence of a catalyst will increase the number of molecules entering the transition state

III. An increase in temperature will increase the rate of a reaction

IV. Increasing the concentration of reactants will increase the rate at which products yield

• II+III+IV

• I+IV

• II + III

• I+II+III

To slow down a chemical reaction you will do one of the following:

• Place the reactants in hot water
• Place the products in ice bath
• Place the reactants in a ice bath
• Keep stirring the reactants with a stirring rod