Activation Energy and its Calculation NEET Questions

Physical Chemistry - Chemical Kinetics

Activation Energy and its Calculation MCQ Questions


1.
Activation energy is defined as
A.
The minimum energy required to form reactants
B.
The minimum energy required to start a reaction
C.
The energy released during the reaction
D.
The energy possessed by all molecules at all times
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ANSWER :
B. The minimum energy required to start a reaction
2.
Which unit is commonly used for activation energy?
A.
kJ/mol
B.
L/mol
C.
K
D.
J
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ANSWER :
B. L/mol
3.
Activation energy is required to
A.
Break old bonds only
B.
Form new bonds only
C.
Initiate the reaction
D.
Lower the entropy
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ANSWER :
C. Initiate the reaction
4.
A catalyst lowers the activation energy by
A.
Changing ΔG
B.
Changing reactant concentration
C.
Providing an alternate reaction path
D.
Changing the enthalpy
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ANSWER :
C. Providing an alternate reaction path
5.
If Ea is high, the rate of reaction is
A.
Fast
B.
Slow
C.
Unaffected
D.
Zero
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ANSWER :
B. Slow
6.
For a successful collision, energy of molecules must be
A.
Equal to the activation energy
B.
More than the activation energy
C.
Less than the activation energy
D.
Equal or more than activation energy
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ANSWER :
D. Equal or more than activation energy