Arrhenius Equation NEET Questions

Physical Chemistry - Chemical Kinetics

Arrhenius Equation MCQ Questions


13.
The Arrhenius plot (ln k vs 1/T) is a straight line because:
A.
ln k is linearly related to 1/T
B.
k is linearly related to T
C.
k is linearly related to 1/T
D.
ln k is linearly related to T
😑 View Answer Rough Work Error
ANSWER :
A. ln k is linearly related to 1/T
14.
If the Arrhenius plot of a reaction is non-linear (curved), it indicates:
A.
The reaction is zero order
B.
The activation energy is zero
C.
The reaction proceeds via more than one mechanism in the temperature range studied
D.
The frequency factor is negative
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ANSWER :
C. The reaction proceeds via more than one mechanism in the temperature range studied
15.
The two-point form of the Arrhenius equation, used to find Eₐ from k₁ at T₁ and k₂ at T₂, is:
A.
log(k₂/k₁) = (Eₐ/2.303R) × [(T₂ - T₁)/(T₁T₂)]
B.
log(k₂/k₁) = (Eₐ/2.303R) × [(T₁ - T₂)/(T₁T₂)]
C.
log(k₁/k₂) = (Eₐ/2.303R) × [(T₂ - T₁)/(T₁T₂)]
D.
log(k₂/k₁) = (Eₐ × R/2.303) × (T₂ - T₁)
😑 View Answer Rough Work Error
ANSWER :
A. log(k₂/k₁) = (Eₐ/2.303R) × [(T₂ - T₁)/(T₁T₂)]
16.
If T₂ > T₁ and the activation energy Eₐ is positive, then in the two-point Arrhenius equation:
A.
k₁ × k₂ = constant
B.
k₂ < k₁
C.
k₂ = k₁
D.
k₂ > k₁ (rate constant at higher temperature is greater)
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ANSWER :
D. k₂ > k₁ (rate constant at higher temperature is greater)
17.
The rate constant of a reaction at 298 K is k₁ and at 308 K is k₂. The ratio k₂/k₁:
A.
Depends on the frequency factor A
B.
Depends on the order of the reaction
C.
Depends on the reactant concentrations
D.
Depends only on Eₐ and the two temperatures
😑 View Answer Rough Work Error
ANSWER :
D. Depends only on Eₐ and the two temperatures
18.
The activation energy (Eₐ) of a reaction represents:
A.
The bond dissociation energy of the strongest bond
B.
The total energy released by the reaction
C.
The difference in energy between reactants and products
D.
The minimum energy that reactant molecules must possess (above their average energy) for an effective collision
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ANSWER :
D. The minimum energy that reactant molecules must possess (above their average energy) for an effective collision