give scientific reason the copper vessels turn greenish and silver article turn blackish when kept open on air for long time
Answers
Explanation:
As copper metal is exposed to sunlight, it corrodes and turns green. Corrosion causes copper metal to turn green when exposed to oxygen. When a copper vessel is exposed to air during the rainy season, the metal reacts with gases, moisture, and ambient gases to produce copper carbonate and copper hydroxide. Because of sulphur (hydrogen sulphide), which is a substrate, silver turns black.
Answer:
1. Silver articles turn blackish on exposure to air for a long time. This is because of silver sulphide (Ag2S) layer formed on the silver articles by the reaction of silver with hydrogen sulphide.
2. Carbon dioxide in moist air reacts with copper vessel. Copper loses its lustre due to formation of greenish layer of copper carbonate (CuCO3) on its surface.
Explanation:
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