Activation Energy and its Calculation NEET Questions

Physical Chemistry - Chemical Kinetics

Activation Energy and its Calculation MCQ Questions


1.
Activation energy of a reaction is defined as:
A.
The minimum extra energy required by reactant molecules above their average energy to form products
B.
The maximum energy attained by reactant molecules
C.
The energy released when products are formed
D.
The total kinetic energy of reactants
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ANSWER :
A. The minimum extra energy required by reactant molecules above their average energy to form products
2.
The Arrhenius equation relating rate constant (k) with temperature is:
A.
k = A/e^(-Ea/RT)
B.
k = A·e^(Ea/RT)
C.
k = A·e^(-RT/Ea)
D.
k = A·e^(-Ea/RT)
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ANSWER :
D. k = A·e^(-Ea/RT)
3.
Taking logarithm of Arrhenius equation gives:
A.
log k = log A − Ea/R
B.
ln k = ln A + Ea/RT
C.
ln k = ln A − Ea/RT
D.
ln k = ln A − Ea·RT
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ANSWER :
C. ln k = ln A − Ea/RT
4.
In the plot of ln k versus 1/T, the slope of the line is:
A.
Ea·R
B.
−Ea/R
C.
+Ea/R
D.
−Ea/(2.303R)
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ANSWER :
B. −Ea/R
5.
The integrated form of Arrhenius equation for two temperatures T₁ and T₂ is:
A.
log(k₂/k₁) = (Ea/R)·[(T₁−T₂)/(T₁T₂)]
B.
log(k₁/k₂) = (Ea/2.303R)·[(T₂−T₁)/(T₁T₂)]
C.
log(k₂/k₁) = (Ea/2.303R)·[(T₂−T₁)/(T₁T₂)]
D.
ln(k₂/k₁) = Ea·R·[(T₂−T₁)/(T₁T₂)]
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ANSWER :
C. log(k₂/k₁) = (Ea/2.303R)·[(T₂−T₁)/(T₁T₂)]
6.
The pre-exponential factor 'A' in Arrhenius equation is also known as:
A.
Activation factor
B.
Energy factor
C.
Frequency factor
D.
Reaction factor
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ANSWER :
C. Frequency factor