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Karnataka Board PUCPUC Science 2nd PUC Class 12

Electrochemical Cells

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Estimated time: 5 minutes
Maharashtra State Board: Class 12

Key Points: Electrochemical Cells

Type Electrolytic Cell Galvanic (Voltaic) Cell
Energy conversion Electrical → Chemical Chemical → Electrical
Nature of reaction Non-spontaneous Spontaneous
Anode Positive Negative
Cathode Negative Positive
Electron flow Cathode → Anode Anode → Cathode
Salt bridge Not required Required

Electrolysis of NaCl

1. Molten NaCl:

  • Oxidation: Cl⁻ → Cl₂ (gas)

  • Reduction: Na⁺ → Na (metal)

  • Products: Na (cathode), Cl₂ (anode)

2. Aqueous NaCl:

  • Oxidation: Cl⁻ → Cl₂

  • Reduction: H₂O → H₂ + OH⁻

  • Products: H₂ (cathode), Cl₂ (anode), NaOH formed

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