Question

why do copper vessels lose shine when exposed to air

Answer 1

ⓗⓔⓨ ⓕⓡⓘⓔⓝⓓ ⓗⓔⓡⓔ ⓘⓢ ⓨⓞⓤⓡ ⓐⓝⓢⓦⓔⓡ

⊙This is because copper is highly reactive metal which forms copper oxide when exposed to air.

⊙Copper vessels are black in colour so they lose their shine when exposed to air.


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Answer 2

This is because copper is highly reactive metal
which forms
1) oxide when in contact with air.
2)oxide is black in colour thus copper vessels lose their shine when exposed to air.