Differential and Integral Forms of Zero and First-Order Reactions and their Characteristics and Half-Lives NEET Questions

Physical Chemistry - Chemical Kinetics

Differential and Integral Forms of Zero and First-Order Reactions and their Characteristics and Half-Lives MCQ Questions


1.
Which of the following is the differential form for a first-order reaction?
A.
d[A]/dt = -k[A]
B.
d[A]/dt = -k
C.
d[A]/dt = k[A]
D.
d[A]/dt = k
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ANSWER :
B. d[A]/dt = -k
2.
The rate of a zero-order reaction depends on
A.
Concentration
B.
Time
C.
Temperature
D.
None of these
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ANSWER :
D. None of these
3.
The half-life of a zero-order reaction is proportional to
A.
Initial concentration
B.
Square of initial concentration
C.
Reciprocal of initial concentration
D.
Independent of concentration
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ANSWER :
A. Initial concentration
4.
The half-life of a first-order reaction is
A.
Independent of initial concentration
B.
Proportional to [A]₀
C.
Proportional to 1/[A]₀
D.
Proportional to square of [A]₀
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ANSWER :
A. Independent of initial concentration
5.
The rate constant of a zero-order reaction is 0.2 mol L⁻¹ s⁻¹. The time required to reduce the concentration of the reactant from 0.5 mol L⁻¹ to zero is:

NEET - 2015

A.
1.25 s
B.
2.5 s
C.
0.5 s
D.
5 s
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ANSWER :
B. 2.5 s
6.
Integral form of a first-order reaction is
A.
k = (1/t) ln([A]₀/[A])
B.
k = ([A]-[A]₀)/t
C.
k = [A]/t
D.
k = ln([A])/t
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ANSWER :
A. k = (1/t) ln([A]₀/[A])