Chemical Kinetics Test

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Chemical Kinetics Test - 13

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Question 1
4 / -1

A catalyst

A
Increases the average kinetic energy of reacting molecules

B
Increases the activation energy

C
Alters the reaction mechanism

D
Increases the frequency of collisions of reacting species
Question 2
4 / -1

Which of the following is a first order reaction?

A

B

C

D
Question 3
4 / -1

Which of the following statements is incorrect?

A
The catalyst does not affect the equilibrium of a reaction

B
Reaction with higher activation energy has higher rate constant

C
In an exothermic reaction, the activation energy of the reverse reaction is higher than that of the forward reaction

D
Half – life period of a first order reaction is independent of initial concentration
Question 4
4 / -1

A reaction involving two different ractants

A
can never be a first order reaction

B
can never be a second order reaction

C
can never be a unimolecular reaction

D
can never be a bimolecular reaction
Question 5
4 / -1

The rate constant of a reaction increases with increase of temperature because

A
The activation energy increases

B
The population of activated molecules increases.

C
The activation energy decreases

D
The population of activated molecules decreases
Question 6
4 / -1

In which of the following cases, does the reaction go farthest to completion?

A
k = 10²

B
k = 10^-2

C
k = 10

D
k = 1
Question 7
4 / -1

If the half–time for a particular reaction is found to be constant and independent of the initial concentration of the reactants then reaction is of

A
first order

B
zero order

C
second order

D
none of these
Question 8
4 / -1

The hydrolysis of methyl formate in acid solution has rate expression: rate = k [HCOOCH₃] [H⁺], the balanced equation being HCOOCH₃+H₂O → HCOOH+CH₃OH The rate law contains [H⁺] though the balanced equation does not contain [H⁺] because

A
more for convenience to express the rate law

B
H⁺ ion is a catalyst

C
H⁺ is an important constituent of any reaction

D
all acids contain H+ ions
Question 9
4 / -1

According to the Arrhenius equation a straight line is to be obtained by plotting the logarithm of the rate constant of a chemical reaction (log k) against

A
T

B
log T

C
1/T

D
log 1/T
Question 10
4 / -1

The plot of concentration of the reactant versus time for a reaction is a straight with a negative slope. The reaction follows a

A
first order rate equation

B
zero order rate equation

C
second order rate equation

D
third order rate equation