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Mg + Pb\(^{2+}\) →  Mg\(^{2+}\) + Pb What is the cell notation for the cell reaction...

Chemistry
JAMB 2025

Mg + Pb\(^{2+}\) →  Mg\(^{2+}\) + Pb

What is the cell notation for the cell reaction above?

  • A. MgIPb\(^{2+}\)IIMg\(^{2+}\)IPb
  • B. MgIMg\(^{2+}\)IIPbIPb\(^{2+}\)
  • C. MgIMg\(^{2+}\)IIPb\(^{2+}\)IPb
  • D. MgIMg\(^+\)IIPbIPb\(^+\)
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Correct Answer: Option C
Explanation

The cell notation convention places the anode on the left and the cathode on the right, separated by a double vertical line representing the salt bridge. A single vertical line represents a phase boundary (solid|aqueous).

The reaction involves:

  • Oxidation (anode, left side): Mg is oxidized to Mg²⁺         Mg  →  Mg\(^{2+}\)  +  2e\(^-\). This is represented as  Mg l Mg\(^{2+}\)
  • Reduction (cathode, right side): Pb²⁺ is reduced to Pb,   Pb\(^{2+}\)  +  2e\(^-\)   →   Pb . This is represented as Pb\(^{2+}\) l Pb
  • The complete notation is  Mg l Mg\(^{2+}\) ll Pb\(^{2+}\) l Pb

There is an explanation video available below.


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Explanation Video

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