The reaction that takes place in Daniel cell is
The reaction that takes place in Daniel cell is
- A)Zn/Zn\(^{2+}\)//Cu\(^{2+}\)/Cu
- B)Zn/Zn\(^{2+}\)//Cu/Cu\(^{2+}\)
- C)Zn\(^{2+}\)/Zn//Cu\(^{2+}\)/Cu
- D)Zn\(^{2+}\)/Zn//Cu/Cu\(^{2+}\)
Correct Answer: A)Zn/Zn\(^{2+}\)//Cu\(^{2+}\)/Cu
Explanation
In a Daniell cell, the reaction that occurs is an electrochemical reaction involving the transfer of electrons between two different metals. The metals used in a Daniell cell are zinc (Zn) and copper (Cu), and their respective ions, Zn\(^{2+}\) and Cu\(^{2+}\). The reaction can be represented as:
Zn/Zn\(^{2+}\)//Cu\(^{2+}\)/Cu (Option A)
In this representation, the forward slash (/) separates the metal from its respective ion, and the double forward slash (//) separates the two half-cells of the Daniell cell. The half-cell on the left (Zn/Zn\(^{2+}\) represents the anode, where oxidation occurs, and the half-cell on the right (Cu\(^{2+}\)/Cu) represents the cathode, where reduction occurs.
During the reaction, zinc loses two electrons and forms zinc ions (Zn\(^{2+}\) at the anode, while copper ions (Cu\(^{2+}\) gain two electrons to form copper metal at the cathode.
The overall reaction can be written as:
Zn(s) + Cu\(^{2+}\)(aq) ? Zn\(^{2+}\)(aq) + Cu(s)
This reaction allows for the flow of electrons in the external circuit and generates electrical energy. The Daniell cell is an important concept in electrochemistry, as it demonstrates the principles of redox reactions, galvanic cells, and the generation of electricity from chemical reactions.