Q51 of 61 Page 4

What is corrosion? What are the ways to retard this process?

Corrosion: metals when kept exposed to most air, get affected and a dull layer of oxide deposits over their surface. This layer is loose and peels off subsequently giving space for formation of more of such layer. In this way, the metal gets wasted layer to layer. This is called corrosion. Ways to retard corrosion: corrosion can be prevented by keeping the metal out of the reach of moist air. The following are the ways to reduce the changes of corrosion
  • by painting metal surfaces with paints 
  • by applying a layer of grease or oil on metal surfaces 
  • by galvanizing 
  • by electroplating 
  • metal can be prevented from rusting by alloying

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    49 Silver does not combine easily with oxygen but silver jewellery tarnishes after sometime? Why? 50 Which one of the following materials is most likely to be corroded? a. a wooden plank              b. a steel chair c. an exposed iron rod       d. an iron rod coated with oil. 52 Compare the properties of metals and nonmetals with respect to malleability, ductility and conductivity 53 Taking the examples of magnesium and sulphur explain how metals and non-metals produce oxides with different characteristics.