Question:
An electrochemical cell can behave like an electrolytic cell when ________ .
An electrochemical cell can behave like an electrolytic cell when ________ .
Updated On: Jun 24, 2024
- $E_{cell}=0$
- $E_{cell} > E_{ext}$
- $E_{ext} > E_{cell}$
- $E_{cell} = E_{ext}$
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The Correct Option is C
Approach Solution - 1
If an external opposite potential is applied on the galvanic cell and increased reacting continues to take place till the opposing voltage reaches the value $1.1\,V$.
At this stage no current will flow through the cell because if external potential further increase then reaction will occurs in opposite direction or reversible reaction.
Hence, this works as an electrolytic cell.
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Approach Solution -2
An electrochemical cell can behave like an electrolytic cell when an external voltage is applied that is greater than the cell's own voltage. This forces the non-spontaneous reaction to occur, which is characteristic of an electrolytic cell.
Therefore, the correct answer is (C): \(E_{ext} > E_{cell}\)
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Concepts Used:
Electrochemical Cells
An electrochemical cell is a device that is used to create electrical energy through the chemical reactions which are involved in it. The electrical energy supplied to electrochemical cells is used to smooth the chemical reactions. In the electrochemical cell, the involved devices have the ability to convert the chemical energy to electrical energy or vice-versa.
Classification of Electrochemical Cell:
Cathode
- Denoted by a positive sign since electrons are consumed here
- A reduction reaction occurs in the cathode of an electrochemical cell
- Electrons move into the cathode
Anode
- Denoted by a negative sign since electrons are liberated here
- An oxidation reaction occurs here
- Electrons move out of the anode
Types of Electrochemical Cells:
Galvanic cells (also known as Voltaic cells)
- Chemical energy is transformed into electrical energy.
- The redox reactions are spontaneous in nature.
- The anode is negatively charged and the cathode is positively charged.
- The electrons originate from the species that undergo oxidation.
Electrolytic cells
- Electrical energy is transformed into chemical energy.
- The redox reactions are non-spontaneous.
- These cells are positively charged anode and negatively charged cathode.
- Electrons originate from an external source.