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Answers
Answer:
Explanation:
a) Sodium and Potassium are stored in kerosene because they are highly reactive and when they comes in contact with atmospheric air they get blazed.
b) Upon exposure to moist air, the copper metal gains a green colour. The formation of green colour is due to corrosion.
c) Blue colour of the copper sulphate solution changes into green colour & then the iron nail acquires a brownish look. This is because that iron is more reactive than copper.
In this reaction, iron displaces copper from the copper sulphate solution.
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Answer:
a. Sodium and potassium are stored in kerosene because they are highly reactive elements. They can easily catch fire even when in contact with air.
b.The copper of the articles slowly reacts with the moisture and the carbondioxide present in the air. So,it forms a layer of copper hydroxide and copper carbonate which is green in colour.
c. The copper of the articles slowly reacts with the moisture and the carbondioxide present in the air. So,it forms a layer of copper hydroxide and copper carbonate which is green in colour.