Order and Molecularity of Reactions NEET Questions

Physical Chemistry - Chemical Kinetics

Order and Molecularity of Reactions MCQ Questions


1.
The order of a reaction is defined as:
A.
The number of molecules taking part in the elementary reaction
B.
The sum of the stoichiometric coefficients of reactants in the balanced equation
C.
The number of steps in the reaction mechanism
D.
The sum of the powers of concentration terms of reactants in the experimentally determined rate law
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ANSWER :
D. The sum of the powers of concentration terms of reactants in the experimentally determined rate law
2.
For the rate law: Rate = k[A]² [B]¹, the overall order of reaction is:
A.
3
B.
2
C.
0
D.
1
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ANSWER :
A. 3
3.
If the rate law for a reaction is Rate = k[A]^(1/2) [B]^(3/2), the overall order is:
A.
1
B.
2
C.
1.5
D.
3
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ANSWER :
B. 2
4.
For the rate law Rate = k[A]^(3/2) [B]⁻¹, the overall order is:
A.
−1
B.
1/2
C.
3/2
D.
5/2
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ANSWER :
B. 1/2
5.
Order of a reaction can be:
A.
Zero, integer, or fractional, including negative values
B.
Only zero or 1
C.
Always equal to the molecularity
D.
Only positive integer values (1, 2, 3)
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ANSWER :
A. Zero, integer, or fractional, including negative values
6.
The order of a reaction with respect to a particular reactant is:
A.
The power to which the concentration of that reactant is raised in the rate law
B.
The number of molecules of that reactant participating in the rate-determining step
C.
Always equal to its stoichiometric coefficient
D.
Always equal to the number of moles of that reactant in the balanced equation
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ANSWER :
A. The power to which the concentration of that reactant is raised in the rate law