Order and Molecularity of Reactions NEET Questions

Physical Chemistry - Chemical Kinetics

Order and Molecularity of Reactions MCQ Questions


7.
Molecularity of a reaction is defined as:
A.
The sum of the powers of concentration terms in the rate law
B.
The number of products formed in the reaction
C.
The number of reacting species (atoms, ions, or molecules) that must collide simultaneously in an elementary reaction
D.
The number of moles of reactants in the balanced equation
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ANSWER :
C. The number of reacting species (atoms, ions, or molecules) that must collide simultaneously in an elementary reaction
8.
Molecularity of a reaction can be:
A.
Zero
B.
Only a small whole number — typically 1, 2, or 3
C.
Negative
D.
Fractional like 1/2 or 3/2
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ANSWER :
B. Only a small whole number — typically 1, 2, or 3
9.
The reaction NH₄NO₂ → N₂ + 2H₂O is classified by molecularity as:
A.
Bimolecular
B.
Unimolecular
C.
Termolecular
D.
Zero molecular
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ANSWER :
B. Unimolecular
10.
The reaction 2HI → H₂ + I₂, when occurring as an elementary process, is:
A.
Bimolecular
B.
Termolecular
C.
Zero molecular
D.
Unimolecular
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ANSWER :
A. Bimolecular
11.
The reaction 2NO + O₂ → 2NO₂, when treated as an elementary process, has molecularity:
A.
1 (unimolecular)
B.
2 (bimolecular)
C.
3 (termolecular)
D.
5 (pentamolecular)
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ANSWER :
C. 3 (termolecular)
12.
Termolecular elementary reactions are rare because:
A.
Three-body interactions are forbidden by quantum mechanics
B.
Three molecules cannot fit in the same region of space
C.
Simultaneous collision of three molecules with proper orientation and energy is highly improbable
D.
Such reactions always have negative activation energies
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ANSWER :
C. Simultaneous collision of three molecules with proper orientation and energy is highly improbable