Relationship between Cell Potential and Gibbs Energy Change NEET Questions

Physical Chemistry - Redox Reactions and Electrochemistry

Relationship between Cell Potential and Gibbs Energy Change MCQ Questions


13.
Gibbs free energy change is related to equilibrium constant by which formula?
A.
ΔG° = -RTlnK
B.
ΔG° = nFE°
C.
ΔG° = -Ecell/nF
D.
ΔG° = RTlnK
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ANSWER :
A. ΔG° = -RTlnK
14.
If E°cell = 0.0 V, then K for the reaction is
A.
Equal to 1
B.
Greater than 1
C.
Less than 1
D.
Zero
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ANSWER :
A. Equal to 1
15.
For a spontaneous redox reaction, E°cell and ΔG° must be
A.
Negative and negative
B.
Positive and positive
C.
Positive and negative
D.
Negative and positive
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ANSWER :
C. Positive and negative
16.
Which equation is used to calculate ΔG for non-standard conditions?
A.
ΔG = -nFE°cell
B.
ΔG = ΔG° + RTlnQ
C.
ΔG = -RTlnQ
D.
ΔG = -nFEcell + RTlnK
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ANSWER :
B. ΔG = ΔG° + RTlnQ
17.
In electrochemical cells, a negative Gibbs energy means
A.
The system absorbs energy
B.
The cell can do electrical work
C.
The cell is not functional
D.
The reaction is at equilibrium
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ANSWER :
B. The cell can do electrical work
18.
If E°cell = 0.059 V and n = 1, what is ΔG° at 298 K?
A.
-5.7 kJ/mol
B.
-5.8 kJ/mol
C.
-6.0 kJ/mol
D.
-5.9 kJ/mol
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ANSWER :
D. -5.9 kJ/mol