Rate Constant and its Units NEET Questions

Physical Chemistry - Chemical Kinetics
Rate Constant and its Units

Rate Constant and its Units MCQ Questions


7.
Units of the rate constant change with the order of reaction. For nth-order reaction, the unit of k can be written as:
A.
L^(1−n) mol^(n−1) time⁻¹
B.
L^(n−1) mol^(1−n) time⁻¹
C.
L^n mol^n time⁻¹
D.
mol time⁻¹
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ANSWER :
B. L^(n−1) mol^(1−n) time⁻¹
8.
The unit of the rate constant for a zero-order reaction (concentration in mol L⁻¹, time in seconds) is:
A.
mol L⁻¹ s⁻¹
B.
L mol⁻¹ s⁻¹
C.
s⁻¹
D.
Dimensionless
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ANSWER :
A. mol L⁻¹ s⁻¹
9.
The unit of the rate constant for a first-order reaction is:
A.
L mol⁻¹ s⁻¹
B.
s⁻¹ (or any time⁻¹ unit)
C.
L² mol⁻² s⁻¹
D.
mol L⁻¹ s⁻¹
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ANSWER :
B. s⁻¹ (or any time⁻¹ unit)
10.
The unit of the rate constant for a second-order reaction is:
A.
s⁻¹
B.
L² mol⁻² s⁻¹
C.
mol L⁻¹ s⁻¹
D.
L mol⁻¹ s⁻¹ (or M⁻¹ s⁻¹)
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ANSWER :
D. L mol⁻¹ s⁻¹ (or M⁻¹ s⁻¹)
11.
The unit of the rate constant for a third-order reaction is:
A.
mol² L⁻² 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
12.
The unit of the rate constant for a half-order reaction is:
A.
L mol⁻¹ s⁻¹
B.
mol^(1/2) L^(−1/2) s⁻¹
C.
s⁻¹
D.
mol^(−1/2) L^(1/2) s⁻¹
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ANSWER :
B. mol^(1/2) L^(−1/2) s⁻¹
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