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When an object made of metal A is kept in air for a considerable time, it loses its shine and becomes almost black due to the formation of a layer of substance B. When an object made of another metal C is kept in damp air for a considerable time, it gets covered with a green layer of substance D. Metal A is the best conductor of electricity whereas metal C is the next best conductor of electricity.(a) What is metal A ?(b) What is metal C ?(c) Name the substance B.(d) Name the substance D.What type of chemical can be used to remove the green layer from metal C and clean it ? Why ? |
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Answer» (a) Silver (b) Copper (c) Silver sulphide (d) Basic copper carbonate (e) Dilute acid solution; The acid sol ution dissolves green coloured basic copper carbonate present on the corroded copper object makes it look shiny, red brown again. |
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