CBSE Class 12 Chemistry Notes: Electrochemistry – Metals Reactivity Series

(HIGH OXIDATION POTENTIAL)

 K (Potassions)      → Most Reactive
 Na (Sodium) (Low Reduction Potential)
 Mg (Magneium)
 Al (Aluminium)
 Zn (Zinc)
 Cu (Copper)
 Ag (Silver)
 Au (Gold) (High Reduction Potential)
 Pt (Platinum) → Least Reactive
 (Low Oxidation Potential)

• Mg + CuSO4 → MgSO4 + Cu
  Ag + NaCl → Can’t displace the salt
  “More reactive metal displaces less reactive metal from it’s salt”

• Mg → Mg2+ + 2e {Oxid. Po = E1, Red Po = E3}
  Zn → Zn2+ + 2e {Oxid. Po = E2, Red Po = E4}
  Zn + MgSO4 → X
  Mg + ZnSO4 → NgSO4 + Zn
  ⇒ E1 > E2
  E3 < E4

• X x  →  x+ + e- E1 {Oxidation Potential}
  Y y → y+ + e- E2 {Oxidation Potential}
  if  E1 > E2 then X is more reactive than Y

 

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