Order and Molecularity of Reactions NEET Questions

Physical Chemistry - Chemical Kinetics

Order and Molecularity of Reactions MCQ Questions


13.
Which of the following statements correctly distinguishes order from molecularity?
A.
Order is experimental; molecularity is theoretical and applies only to elementary reactions
B.
Both are always equal for any reaction
C.
Order applies only to elementary reactions; molecularity applies to all reactions
D.
Order is theoretical; molecularity is experimental
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ANSWER :
A. Order is experimental; molecularity is theoretical and applies only to elementary reactions
14.
Which of the following CANNOT be true about order and molecularity?
A.
Order can be fractional
B.
Molecularity of a reaction can be 0
C.
Molecularity equals order for elementary reactions
D.
Order of a reaction can be 0
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ANSWER :
B. Molecularity of a reaction can be 0
15.
For an elementary reaction, which is true?
A.
Molecularity is always less than order
B.
Order = Molecularity (both equal the sum of stoichiometric coefficients)
C.
Order is always less than molecularity
D.
Order ≠ Molecularity always
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ANSWER :
B. Order = Molecularity (both equal the sum of stoichiometric coefficients)
16.
For a complex reaction proceeding via multiple elementary steps, the overall order of the reaction is determined by:
A.
The total number of steps
B.
The molecularity of the slowest (rate-determining) step
C.
The molecularity of the fastest step
D.
The sum of molecularities of all steps
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ANSWER :
B. The molecularity of the slowest (rate-determining) step
17.
Which is/are TRUE about a complex reaction?
A.
Molecularity has no meaning for the overall reaction; only order is defined experimentally
B.
Both order and molecularity have well-defined values
C.
Order equals the sum of stoichiometric coefficients
D.
Molecularity is always 3
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ANSWER :
A. Molecularity has no meaning for the overall reaction; only order is defined experimentally
18.
For a reaction A → Products, when [A] is doubled, the rate also doubles. The order with respect to A is:
A.
2 (second order)
B.
3 (third order)
C.
0 (zero order)
D.
1 (first order)
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ANSWER :
D. 1 (first order)