Multiple choice

On dipping Zn rod in NaCl solution, the portion dipped in solution gets corroded while portion above water is protected. This type of corrosion is called

  1. inter-granular corrosion

  2. crevice corrosion

  3. waterline corrosion

  4. differential aeration corrosion
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

If a metal rod is dipped in electrolyte, the portion dipped in water is poor in oxygen concentration and works as anode and gets corroded and the portion above the water acts as cathode, which gets protected. The system will act as a concentration cell. This type of corrosion is called differential aeration corrosion.

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