Chemical Kinetics MCQ Practice Test – NEET Chemistry (Free)

For a gaseous reaction, the rate may be expressed in the unit

atm s⁻¹
atm²
s⁻¹ atm⁻¹
atm

The expression that relates the rate of a reaction to the concentrations of the reactants is called the

Nernst equation
rate law
Arrhenius equation
law of mass action at equilibrium

The activation energy for a simple chemical reaction A ⇌ B is E_a in the forward direction. The activation energy for the reverse reaction

is the negative of E_a
is always double of E_a
is always less than E_a
can be less than or more than E_a

Which of the following can be zero for a reaction?

Number of reactants
Number of collisions in an elementary step
Molecularity
Order

In a first order reaction, the ratio of the time for 99% completion to the time for 90% completion is

1.1
10.0
2.0
1.5

Which of the following is the correct form of the Arrhenius equation for two temperatures?

\( \log\dfrac{k_2}{k_1} = \dfrac{2.303E_a}{R}\left(\dfrac{T_2-T_1}{T_1T_2}\right) \)
\( \log\dfrac{k_2}{k_1} = \dfrac{E_a}{2.303R}\left(\dfrac{T_2-T_1}{T_1T_2}\right) \)
\( \log\dfrac{k_1}{k_2} = \dfrac{E_a}{2.303R}\left(\dfrac{T_2-T_1}{T_1T_2}\right) \)
\( \log\dfrac{k_2}{k_1} = \dfrac{E_a}{2.303R}\left(\dfrac{T_1-T_2}{T_1T_2}\right) \)

A biochemical reaction is carried out in the laboratory, outside the human body and in the absence of the enzyme, and its rate is found to be 10⁻⁶ times the rate in the body. The activation energy of the reaction in the presence of the enzyme is

the same as the E_a obtained in the laboratory
zero
different from (lower than) the E_a obtained in the laboratory
higher than the E_a obtained in the laboratory

A reaction for which the rate is independent of the concentration of the reactant is of

first order
second order
zero order
third order

Assertion: Hydrolysis of ethyl acetate in a large excess of water is a pseudo first order reaction.
Reason: The concentration of water remains practically constant during the reaction.

Both Assertion and Reason are true and Reason is the correct explanation of Assertion
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
Assertion is true but Reason is false
Both Assertion and Reason are false

Assertion: For an endothermic reaction, the activation energy of the forward reaction is greater than the enthalpy change.
Reason: The activation energy of the backward reaction is always zero.

Both Assertion and Reason are true and Reason is the correct explanation of Assertion
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
Assertion is true but Reason is false
Both Assertion and Reason are false

The rate of a first order reaction is 0.04 mol L⁻¹ s⁻¹ at 10 seconds and 0.03 mol L⁻¹ s⁻¹ at 20 seconds after initiation of the reaction. The half-life period of the reaction is

24.1 s
44.1 s
54.1 s
34.1 s

In the reaction CH₃Br + OH⁻ → CH₃OH + Br⁻, methanol is formed only when

the OH⁻ ion attacks the carbon atom from the side opposite to Br
OH⁻ attacks the bromine atom
the energy of collision is zero
the molecules collide with any orientation

For the reaction 2A + B → 3C + D, which of the following does NOT express the reaction rate?

\( -\dfrac{d[C]}{3\,dt} \)
\( -\dfrac{d[A]}{2\,dt} \)
\( \dfrac{d[D]}{dt} \)
\( -\dfrac{d[B]}{dt} \)

The mechanism of a hypothetical reaction X₂ + Y₂ → 2XY is given below:
(i) X₂ ⇌ X + X (fast)
(ii) X + Y₂ → XY + Y (slow)
(iii) X + Y → XY (fast)
The overall order of the reaction will be

1.5
2
1
0

In the I⁻-catalysed decomposition of H₂O₂, the species IO⁻ is

a reactant in the overall equation
a catalyst
a product
a reaction intermediate

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