a) Why do gold and silver not corrode in moist air?
b) Why is copper vessel covered with green coating in rainy season?
c) Why magnesium ribbon starts floating in hot water?
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Answer:
1.
Gold and silver are the least reactive metals in the rectivity series, hence can not bond with oxygen easily. Therefore they both can not get corroded easily
2.
Copper metal when exposed to air turns green in colour due to corrosion. When copper vessel is exposed to air in rainy season, the metal reacts with gases and moisture and atmospheric gases to form a mixture of copper carbonate and copper hydroxide.
3.
The hydrogen gas evolved when magnesium reacts with water doesn't catch fire because the heat developed is very low. But hydrogen gas comes out as bubbles and sticks to the surface of magnesium ribbon.
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