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

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

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

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

A

Directly proportional to

B

Inversely proportional to

C

Independent of

D

None of these

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

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

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

রাসায়নিক বিক্রিয়ায় বিক্রিয়ক ও উৎপাদের (reactant and product of a chemical reaction ) মধ্যে মূল পরিবর্তন ঘটে কোনটি?

A

অভ্যন্তরীণ শক্তি

B

স্থিতি শক্তি

C

গতি শক্তি

D

বন্ধন শক্তি

Limiting reactant in a chemical reaction decides the

A

Rate constant

B

Conversion

C

Reaction speed

D

Equilibrium constant

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

A

Linearly with time

B

Exponentially with time

C

Very abruptly towards the end of the reaction

D

Logarithmically with time

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

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