Multiple choice

When a copper vessel is exposed to moist air, a green coating is formed on its surface. What chemical compounds are present in that coating?

  1. Magnesium oxide and magnesium hydroxide

  2. Copper oxide and copper hydroxide

  3. Copper hydroxide and copper carbonate

  4. Copper oxide and copper carbonate

  5. Magnesium oxide and copper oxide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

It is the heavy, metallic and hard tin dioxide (SnO2). It is the major ore of tin. It is colourless when pure, but brown or black when iron impurities are present.

Keep practicing — related questions