3. Write scientific reasons.
a. The stainless steel vessels in kitchen
have copper coating on the bottom.
b. Copper and brass vessels are cleaned
with lemon.
c. Sodium metal is kept in kerosene.
Answers
a) The stainless steel vessels in Kitchen have copper coating on the bottom because copper is good conductor of heat and electricity, by using copper cookware, any meal can be prepared in a perfect and gentle way. ... Copper vessels get tarnished due to corrosion of copper metal.
b) The citric acid present in the lemon or tamarind neutralises the basis copper carbonate and dissolves the layer. That is why, tarnished copper vessels are cleaned with lemon or tamarind juice to give the surface of the copper vessel its characteristic lustre.
c) Sodium is a highly reactive metal and reacts vigorously with the oxygen, carbon dioxide and moisture present in the air such that it may even cause a fire. To prevent this explosive reaction, Sodium is kept immersed in kerosene because Sodium doesn't react with kerosene.
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