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CBSE Class 8 Answered

Explain corrosion
Asked by dipanshuashokagarwal | 10 Jul, 2019, 05:45: PM
answered-by-expert Expert Answer
  • When the surface of a metal is attacked by air, moisture or any other substance around it, the metal is said to corrode and the phenomenon is known as corrosion.
  • Copper forms a green deposit on its surface when exposed to moist air. This green substance is copper carbonate.
  • Silver gets tarnished when exposed to the atmosphere and forms a black coating of silver sulphide.
  • Iron reacts with moist air to acquire a coating of brown flaky substance called rust which is hydrated iron (III) oxide (Fe2O3.xH2O).
Answered by Sheetal Kolte | 11 Jul, 2019, 11:27: AM

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