The concentration of A in a first order reaction, A → B, decreases

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

A

Linearly

B

Exponentially

C

Logarithmically

D

Inversely

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

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

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

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

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

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

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

If the time required to complete a definite fraction of reaction varies inversely as the concentration of the reactants, then the order of reaction is

A

0

B

1

C

2

D

3

At very high concentration of enzymes, the rate of fermentation chemical reaction is __________ the concentration of reactants.

A

Independent of

B

Directly proportional to

C

Inversely proportional to

D

Proportional to the square of

In BOF, desiliconisation is a first order reaction. So the silicon content of the metal decreases

A

Linearly with time

B

Exponentially with time

C

Logarithmically with time

D

In proportion to the square root of time

The concentration of A in a first order reaction, A → B, decreases

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