4. light
5. Why does a copper vessel has green coating in rainy season?
6 What is the name the ons which burns with a pop sound?
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Explanation:
5.A copper vessel gets covered with green coating in rainy season because the metal reacts with atmospheric CO2in the presence of moisture to form green basic copper carbonate.
6.The pop sound comes from the small explosion formed by the burningof Hydrogen with oxygen. Other common gasses, such as water vapour, nitrogen, and carbon dioxide will not burn with oxygen, so willnot give a pop.
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