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Question
When copper is exposed to moist air, its surface is coated with a green layer of ______.
Options
verdigris, CuCO3.Cu(OH)2 only
bronchanite, CuSO4.3Cu(OH)2 only
atacamite, CuCl2.3Cu(OH)2 only
all of the above
MCQ
Fill in the Blanks
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Solution
When copper is exposed to moist air, its surface is coated with a green layer of verdigris, CuCO3.Cu(OH)2, bronchanite, CuSO4.3Cu(OH)2 and atacamite, CuCl2.3Cu(OH)2.
Explanation:
Blister copper is the impure form of copper obtained during the final stage of copper metallurgy using a Bessemer converter. When it is exposed to air, its surface slowly reacts with carbon dioxide, moisture, and other gases. This forms basic copper compounds like verdigris, brochantite, and atacamite.
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