Multiple choice

Which of the following compounds is present in the green coating verdigris?

  1. Aluminium

  2. Tin

  3. Copper

  4. Copper carbonate

  5. Iron oxide
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Copper turns green when exposed to air due to the formation of a protective layer of copper carbonate called verdigris. Verdigris is a green coating or patina formed, when an alloy of copper, bronze or brass is weathered and exposed to the atmosphere or water over a long period of time. The colour of verdigris varies from shades of blue to shades of green. The simple composition of verdigris is copper carbonate and copper hydroxide,  but if verdigris is being formed at the seashore or somewhere near the sea it consists of copper chloride.

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