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81.

A catalyst

A.	decreases the activation energy	B.	alters the reaction mechanism
C.	increases the frequency of collisions of reacting species	D.	all of these answers.

82.

If a solid-gas non-catalytic reaction occurs at very high temperature, the rate controlling step is

A.	film diffusion	B.	chemical reaction
C.	ash layer diffusion	D.	pore diffusion.

83.

Ionic reactions proceed in

A.	solid state only	B.	liquid state only
C.	any state	D.	solution

84.

The rate constant of a reaction increases by

A.	increasing the concentration of reactants	B.	increasing the pressure
C.	increasing the temperature	D.	carrying out the reaction for a longer time.

85.

When a catalyst increases the rate of a chemical reaction, the volue of the rate constant

A.	remains constant	B.	increases
C.	decreases with increase in the order of reaction	D.	beomes infinite.

86.

Which of the following does not influence the rate of a reaction?

A.	Temperature	B.	Concentration of reactants
C.	Catalyst	D.	Number of molecules of reactants taking part in a reaction.

87.

At a certain temperature, the helf-life period for the catalytic ddecomposition of NH3 at 50 mmHg was 4 hour and at 100 mmHg pressure was 3.2 hour. The order of the reaction is

A.	two	B.	three
C.	zero	D.	one.

88.

In a reaction, the threshold energy is equal to

A.	activation energy	B.	activation energy + normal energy of reactants
C.	normal energy of reactants	D.	activation energy - normal energy of reactants.

89.

During the course of a chemical reaction, the rate of a reaction

A.	increases as the reaction proceeds	B.	decreases as the reaction proceeds
C.	cannot be predicted	D.	remains constant throughout the reaction.