Chemical Kinetics

1. What will be the fraction of molecules having energy equal to or greater than activation energy, Ea?

• K

• A

• Ae-Ea/Rt

• e-Ea/Rt

Tags

NGSS.HS-PS1-5

What type of reaction is this?

• Second order

• Unimolecular

• Pseudo-unimolecular

• Third order

Tags

NGSS.HS-PS1-5

Which among the following is a false statement?

• Rate of zero order reaction is independent of initial concentration of reactant.

• Half life of a third order reaction is inversely proportional to square of initial concentration of the reactant.

• Molecularity of a reaction may be zero or fraction.

• For a first order reaction, t1/2=0.693K

Tags

NGSS.HS-PS1-5

Which of the following statements about the catalyst is true?

• A catalyst accelerates the rate of reaction by bringing down the activation energy.

• A catalyst does not participate in reaction mechanism.

• A catalyst makes the reaction feasible by making ∆G more negative.

• A catalyst makes equilibrium constant more favorable for forward reaction.

Tags

NGSS.HS-PS1-5

An endothermic reaction with high activation energy for the forward reaction is given by the diagram.

• A

• B

• C

• D

Tags

NGSS.HS-PS1-4

For a chemical reaction A→B, it is found that the rate of reaction doubles when the concentration of A is increased four times. The order of reaction is

• Two

• One

• Half

• Zero

Tags

NGSS.HS-PS1-5

The half life of the first order reaction having rate constant K = 1.7 x 10-5s-1 is

• 12.1 h

• 9.7 h

• 11.3 h

• 1.8 h

when the rate of the reaction is equal to the rate constant, the order of the reaction is

• zero order

• first order

• second order

• third order

Tags

NGSS.HS-PS1-5

A catalyst alters, which of the following in a chemical reaction?

• Entropy

• Enthalpy

• Internal energy

• Activation energy

If the rate of a reaction is expressed by, rate = A [A]² [B], the order of reaction will be

• 2

• 3

• 1

• 0

Tags

NGSS.HS-PS1-5