Madhya Pradesh Police Exam Model Paper 9

The correct answer is corrosion.

• Corrosion s the process od slow conversion of metals into their undesirable compounds(oxides) by the reaction with moisture present in the atmosphere.

• After some days, statues of brass and bronze become green due to corrosion.
• Examples of corrosion are:
  • Rusting of iron.
  • The green coating on the surface of copper.
  • Tarnishing of silver.
• Corrosion can be prevented by:
  • Painting.
  • Oiling.
  • Galvanization.
  • Chrome plating.
  • Anodising.
• The factors affecting corrosion are:
  • Reactivity of the metal.
  • Air and moisture.
  • Strains in metal.
  • Presence of electrolytes.
  • Presence of impurities.