Rate Constant and its Units NEET Questions

Physical Chemistry - Chemical Kinetics

Rate Constant and its Units MCQ Questions


13.
Which of the following reactions will have rate constant with unit s⁻¹?
A.
Rate = k[A]^2
B.
Rate = k[A][B]
C.
Rate = k
D.
Rate = k[A]³
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ANSWER :
C. Rate = k
14.
Unit of rate constant of second-order reaction in SI is
A.
s⁻¹
B.
L mol⁻¹ s⁻¹
C.
m³ mol⁻¹ s⁻¹
D.
mol L⁻¹ s⁻¹
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ANSWER :
C. m³ mol⁻¹ s⁻¹
15.
If rate constant k = 2.5 × 10⁻³ mol⁻¹ L s⁻¹, the reaction is
A.
Zero order
B.
First order
C.
Second order
D.
Third order
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ANSWER :
C. Second order
16.
What is the unit of rate constant if rate = k[A]²[B]?
A.
mol⁻² L² s⁻¹
B.
L mol⁻¹ s⁻¹
C.
L² mol⁻² s⁻¹
D.
s⁻¹
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ANSWER :
C. L² mol⁻² s⁻¹
17.
For an nth-order reaction, unit of k is
A.
dimensionless
B.
depends on n
C.
L mol⁻¹ s⁻¹
D.
always s⁻¹
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ANSWER :
B. depends on n
18.
Rate constant of a zero-order reaction depends on
A.
concentration only
B.
temperature only
C.
activation energy only
D.
none of these
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ANSWER :
B. temperature only