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Electrochemistry — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryElectrochemistry1 Mark
MCQ
In the rusting of iron, iron has been:
  • A
    Oxidised
  • B
    Reduced
  • C
    Vaporised
  • D
    Decomposed
✓

Answer

  1. Oxidised

Explanation:

In corrosion, metal is oxidised by loss of electrons to oxygen to form metal oxide. In rusting of iron, at one spot of the iron object oxidation occurs and that spot behaves as an anode.

Anode: Fe(s) → Fe2+ (aq) + 2e−

Cathode: 4e- + 4H+(aq) + O2​(aq) → 2H2​O(l)

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