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Metals and Non-Metals — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMetals and Non-Metals1 Mark
MCQ
If copper is kept exposed to damp air for a considerable time, it gets a green coating on its surface. This is due to the formation of:
  • A
    Hydrated copper sulphate.
  • B
    Copper oxide.
  • ✓
    Basic copper carbonate.
  • D
    Copper nitrate.
✓

Answer

Correct option: C.
Basic copper carbonate.
Copper reacts slowly with water and carbon dioxide in the atmosphere to form copper carbonate. This gives a green colour coating to its surface.

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