i. Aluminium is used for making utensils for cooking because of its high thermal conductivity, corrosion resistance and comparatively cheap rate. Aluminium reacts with oxygen and forms a protective oxide layer which prevents further oxidation. It doesn’t corrode like other metals (like iron). It is comparatively cheaper than gold, silver and copper.
ii. Copper is used in making vessels because of its higher thermal conductivity as compared to iron or steel. Moreover, it ensures uniform heat distribution. It is cheaper than silver and gold.
iii. Gold is used in ornaments because it is a noble metal (doesn’t corrode or react easily, so lasts long), more lustrous and malleable as compared to other metals like aluminium, copper etc.
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