What happens when copper vessel is exposed to moist air for long time?
(b) How will you test hydrogen gas
Answers
Answer:
Copper metal when exposed to air turns green in colour due to corrosion. When the copper vessel is exposed to air in the rainy season, the metal reacts with gases and moisture and atmospheric gases to form a mixture of copper carbonate and copper hydroxide. This gives a green colour to the surface of copper metal.
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Answer:
When a copper vessel is exposed to moist air for long time it develops a green layer on its surface. Copper corrodes by oxidation during which it reacts with oxygen within the air to make oxide. Oxide then combines with CO2 to form copper carbonate, which provides it a green color.
The chemical reaction is
2Cu + H₂O + CO₂ + O₂ → Cu(OH)₂+ CuCO₃
(b) To test the presence of hydrogen the following test can be performed-
A lighted wooden splint makes a popping sound in a test tube of hydrogen.
Characteristic test for hydrogen (H2) gas can be performed by bringing a burning candle near the source of hydrogen. On doing so, hydrogen gas burns with a squeaky pop sound. Hydrogen gas is recognised by the ‘pop’ when it burns. The ‘pop’ is the sound of a small explosion. Hydrogen gas is highly flammable.