Half-life period for a first order reaction is __________ the initial concentration of the reactant.

If the time required to change the concentration of reactant to half its original value is independent of the initial concentration, the order of reaction is

A

Zero

B

One

C

Two

D

Three

If n = overall order of a chemical reaction. a = initial concentration of reactant. t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship.

A

$${\text{t}} \propto \frac{1}{{{{\text{a}}^{\text{n}}}}}$$

B

$${\text{t}} \propto \frac{1}{{{{\text{a}}^{{\text{n}} - 1}}}}$$

C

$${\text{t}} \propto \frac{1}{{{{\text{a}}^{{\text{n}} + 1}}}}$$

D

$${\text{t}} \propto {{\text{a}}^{\text{n}}}$$

A chemical reaction is of zero order, when the reaction rate is (where, CA = concentration of reactant)

A

$$ \propto {\text{CA}}$$

B

$$ \propto \frac{1}{{{\text{CA}}}}$$

C

Independent of temperature

D

None of these

For a first order chemical reaction, the concentration of the reactant decreases __________ with time.

A

Linearly

B

Exponentially

C

Logarithmically

D

Inversely

The conversion of a reactant, undergoing a first order reaction, at a time equal to three times the half life of the reaction is

A

0.875

B

0.5

C

0.425

D

Data insufficient to calculate

If the time required for half change is inversely proportional to the square of initial concentration and the velocity depends on the units in which the concentration term is expressed, then the order of reaction is

A

1

B

2

C

3

D

0

What is the order of a chemical reaction in which doubling the initial concentration of the reactants doubles the half life time of the reaction?

A

0

B

1

C

2

D

3

The knowledge of initial concentration and rate constant is necessary to determine the half life time of a reaction of __________ order.

A

Zero

B

First

C

Second

D

None of these

Overall rate of reaction in a heterogenous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually __________ the concentration of catalyst, if it does not entail a chain mechanism.

A

Proportional to

B

Independent of

C

Inversely proportional to

D

Proportional to the square of

With increase in initial concentration, the fractional conversion of a first order reaction in a given time

A

Increases

B

Decreases

C

Remains constant

D

Unpredictable

Half-life period for a first order reaction is __________ the initial concentration of the reactant.

Related Questions