Reaction Kinetics

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

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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

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NGSS.HS-PS1-5

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

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NGSS.HS-PS1-5

The number of molecules of the reactants taking part in a single step of the reaction is indicative of

• order of a reaction

• molecularity of a reaction

• fast step of the mechanism of a reaction

• half-life of the reaction

The overall rate of a reaction is governed by

• the rate of fastest intermediate step

• the sum total of the rates of all intermediate steps

• the average of the rates of all the intermediate steps

• the rate of slowest intermediate step

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NGSS.HS-PS1-5

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

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NGSS.HS-PS1-5

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

• Entropy

• Enthalpy

• Internal energy

• Activation energy

In pseudo unimolecular reactions

• both the reactants are present in low concentration

• both the reactants are present in same concentration

• one of the reactant is present in excess

• one of the reactant is non-reactive

What two factors govern whether a collision between reacting particles will be effective?

• orientation and potential energy 

• kinetic energy and temperature 

• kinetic energy and orientation 

• potential energy and kinetic energy 

Which of the following increase the reaction rate?

• less surface area

• lower temperature

• an inhibitor

• increased concentration

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NGSS.HS-PS1-5