Q49 of 61 Page 4

Silver does not combine easily with oxygen but silver jewellery tarnishes after sometime? Why?

Silver does not combine with oxygen easily but jewellery exposed to atmosphere tarnishes black after some time because it reacts with gases like hydrogen sulphide in air to form silver sulphide which is black.

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47 Give two reasons for aluminium being preferred to copper for manufacturing cooking utensils. 48 Why does an aluminium vessel loose its shine so soon after use? 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. 51 What is corrosion? What are the ways to retard this process?