Gujarat BoardEnglish MediumSTD 8ScienceMaterials : Metals and Non-Metals2 Marks
Question
Copper vessel in due course acquires a dull green coating.
✓
Answer
$-$When copper vessels is exposed to moist air for a long time, it reacts with oxygen and carbon dioxide.
$-$During this reaction a layer of mixture of copper hydroxide $[\ce{Ca(OH)_2}]$ and copper carbonate $(\ce{CuCO_3})$ is formed.
$-$The colour of this mixture is green, So, copper vessel in due course acquires a dull green coating.
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