Chemical Kinetics Test

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Chemical Kinetics Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements is correct for a reaction of first order?

A
Half life varies directly with the concentration of the reactant

B
A plot of concentration of the reactant against time is linear

C
Fractional change is equal to 1-e^-kl

D
A plot of [A]₀/[A] against time is a straight line

Solution

For 1st order reaction : (a - x) = a e^-kt;
x/a = 1 - e^-kt
Question 2
1 / -0

In an exothermic reaction A → B, the activation energy of reverse reaction is twice that of forward reaction. If enthalpy of the reaction is - 80 k J mol^-1, calculate the activation energy of the reverse reaction.

A
20.0 kJ mol^-1

B
140.0 kJ mol^-1

C
120.0 kJ mol^-1

D
160.0 kJ mol^-1

Solution

E_a = activation energy for forward reaction, E_a that
for reverse reaction. Then, E_a - E_a = ΔH
or, E_a - 2E_a = -80, E_a = 80kJ, E_a= 2 ×80kJ
Question 3
1 / -0

At certain temperature, the first order rate constant k₁ is found to be smaller than the second order rate constant k₂. if the energy of activation, E_a(1), for the first order reaction is greater than the energy of activation, E_a(2)for the second order reaction, then on raising the temperature

A
k₁ will increase faster than k₂ but will always remain less than k₂

B
k₂ will increase faster than k₁

C
k₁ will increase faster than k₂ and become equal to k₂

D
k₁ will increase faster than k₂ and exceed k₂

Solution

on raising the temperature k₁ will increase faster than k₂ but will always remain less than k_2,
Question 4
1 / -0

Which of the following is/are pseudo first order reactions?

A
The inversion of sucrose in the presence of an acid

B
The basic hydrolysis of ethyl acetate

C
The decomposition of ammonium nitrite in aqueous solution.

D
The acidic hydrolysis of ethyl acetate

Solution

The inversion of sucrose in the presence of an acid and the acidic
hydrolysis of ethyl acetate are pseudo first order reactions.
Question 5
1 / -0

What happens when the temperature of a reaction system is increased by 10°C?

A
The activation energy of the reaction is lowered

B
The effective number of collisions between the molecules possessing certain threshold energy increases at least by 100%

C
The total number of collisions between reacting molecules increases at least by 100%

D
The total number of collisions between reacting molecules increases merely by 1-2%

Solution

Whenever the temperature of a reaction system is increased by 10°C, the effective number of collisions between the molecules possessing certain threshold energy increases at least by 100% and the total number of collisions between reacting molecules increases merely by 1-2%.

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Chemical Kinetics Test - 4

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Chemical Kinetics Test - 4

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Question 1

Half life varies directly with the concentration of the reactant

A plot of concentration of the reactant against time is linear

Fractional change is equal to 1-e-kl

A plot of [A]0/[A] against time is a straight line

Solution

Question 2

20.0 kJ mol-1

140.0 kJ mol-1

120.0 kJ mol-1

160.0 kJ mol-1

Solution

Question 3

k1 will increase faster than k2 but will always remain less than k2

k2 will increase faster than k1

k1 will increase faster than k2 and become equal to k2

k1 will increase faster than k2 and exceed k2

Solution

Question 4

The inversion of sucrose in the presence of an acid

The basic hydrolysis of ethyl acetate

The decomposition of ammonium nitrite in aqueous solution.

The acidic hydrolysis of ethyl acetate

Solution

Question 5

The activation energy of the reaction is lowered

The effective number of collisions between the molecules possessing certain threshold energy increases at least by 100%

The total number of collisions between reacting molecules increases at least by 100%

The total number of collisions between reacting molecules increases merely by 1-2%

Solution

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Fractional change is equal to 1-e^-kl

A plot of [A]₀/[A] against time is a straight line

20.0 kJ mol^-1

140.0 kJ mol^-1

120.0 kJ mol^-1

160.0 kJ mol^-1

k₁ will increase faster than k₂ but will always remain less than k₂

k₂ will increase faster than k₁

k₁ will increase faster than k₂ and become equal to k₂

k₁ will increase faster than k₂ and exceed k₂