Activation Energy and its Calculation NEET Questions

Physical Chemistry - Chemical Kinetics

Activation Energy and its Calculation MCQ Questions


13.
If activation energy is 83.14 kJ/mol, then slope of ln k vs 1/T plot is
A.
–10000
B.
–10
C.
–100
D.
–83140
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ANSWER :
A. –10000
14.
A catalyst works by
A.
Decreasing ΔH
B.
Increasing temperature
C.
Decreasing Ea
D.
Decreasing entropy
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ANSWER :
C. Decreasing Ea
15.
Activation energy affects
A.
Rate constant only
B.
Equilibrium only
C.
Enthalpy only
D.
Both rate and equilibrium
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ANSWER :
A. Rate constant only
16.
High activation energy means
A.
Slower reaction
B.
Faster reaction
C.
No reaction
D.
Spontaneous reaction
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ANSWER :
A. Slower reaction
17.
Ea can be calculated using which modified Arrhenius equation?
A.
k = Ae^–Ea/RT
B.
log k = log A – Ea/2.303RT
C.
ln T = Ea/RT
D.
ln A = –Ea/RT
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ANSWER :
B. log k = log A – Ea/2.303RT
18.
Arrhenius equation allows determination of Ea by plotting
A.
log A vs T
B.
log k vs 1/T
C.
k vs 1/T
D.
T vs log k
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ANSWER :
B. log k vs 1/T