Question:
The reaction is spontaneous if the cell potential is
The reaction is spontaneous if the cell potential is
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A positive cell potential indicates that the redox reaction will occur spontaneously in the forward direction.
Updated On: May 2, 2026
- positive
- negative
- zero
- infinite
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
The relationship between Gibbs free energy and cell potential is \(\Delta G = -nFE_{cell}\).
Step 2: Detailed Explanation:
For a spontaneous reaction, \(\Delta G<0\). Since \(-nF\) is negative, \(E_{cell}\) must be positive to make \(\Delta G\) negative.
\(E_{cell}>0\) ⇒ \(\Delta G<0\) ⇒ spontaneous reaction.
\(E_{cell}<0\) ⇒ \(\Delta G>0\) ⇒ non-spontaneous.
\(E_{cell} = 0\) ⇒ \(\Delta G = 0\) ⇒ equilibrium.
Step 3: Final Answer:
A reaction is spontaneous when the cell potential is positive, option (A).
The relationship between Gibbs free energy and cell potential is \(\Delta G = -nFE_{cell}\).
Step 2: Detailed Explanation:
For a spontaneous reaction, \(\Delta G<0\). Since \(-nF\) is negative, \(E_{cell}\) must be positive to make \(\Delta G\) negative.
\(E_{cell}>0\) ⇒ \(\Delta G<0\) ⇒ spontaneous reaction.
\(E_{cell}<0\) ⇒ \(\Delta G>0\) ⇒ non-spontaneous.
\(E_{cell} = 0\) ⇒ \(\Delta G = 0\) ⇒ equilibrium.
Step 3: Final Answer:
A reaction is spontaneous when the cell potential is positive, option (A).
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