Activation Energy and its Calculation NEET Questions

Physical Chemistry - Chemical Kinetics
Activation Energy and its Calculation

Activation Energy and its Calculation MCQ Questions


13.
The relationship between activation energies of forward (Ef) and backward (Eb) reactions and enthalpy change (ΔH) is:
A.
ΔH = Ef − Eb
B.
ΔH = Eb − Ef
C.
ΔH = Ef + Eb
D.
ΔH = Ef × Eb
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ANSWER :
A. ΔH = Ef − Eb
14.
A catalyst increases the rate of reaction by:
A.
Increasing the temperature
B.
Lowering the activation energy of the reaction
C.
Increasing the concentration of reactants
D.
Increasing the activation energy
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ANSWER :
B. Lowering the activation energy of the reaction
15.
If the activation energy of a reaction is 50 kJ/mol and temperature is increased from 27°C to 37°C, the ratio k₂/k₁ is approximately (R = 8.314 J/mol/K):
A.
≈ 1
B.
≈ 4
C.
≈ 0.5
D.
≈ 2
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ANSWER :
D. ≈ 2
16.
The Arrhenius plot (ln k vs 1/T) for a reaction is found to have a slope of −1×10⁴ K. The activation energy of the reaction is (R = 8.314 J/mol/K):
A.
0.8314 kJ/mol
B.
8.314 kJ/mol
C.
831.4 kJ/mol
D.
83.14 kJ/mol
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ANSWER :
D. 83.14 kJ/mol
17.
The intercept of Arrhenius plot (ln k vs 1/T) on the y-axis equals:
A.
ln k₀
B.
−ln A
C.
ln A
D.
−Ea/R
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ANSWER :
C. ln A
18.
If the activation energy of a reaction is high, the reaction:
A.
Is always fast
B.
Is independent of temperature
C.
Is slow at room temperature but speeds up significantly with temperature
D.
Has zero rate at any temperature
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ANSWER :
C. Is slow at room temperature but speeds up significantly with temperature
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