Question

why we store sodium in karo

Answer 1

Bcoz sodium is highly reactive with Atmospheric oxygen. To avoid sodium from reacting with oxygen we store it in kerosene. In presence Atmospheric oxygen it burns and converts into Ash. To prevent this reaction happening we store it in Kerosene.
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Answer 2

Sodium is a very reactive metal. It is kept in kerosene to prevent it from coming in contact with oxygen and moisture. If this happens, it will react with the moisture present in air and form sodium hydroxide. This is a strongly exothermic reaction, and lot of heat is generated.
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