Question

why sodium metal is kept in kerosene oil ​

Answer 1

Sodium (Na) 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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Answer 2

Because sodium is highly reactive and it readily reacts with atmospheric oxygen and catches fire. when kept in water it floats over water as it is lighter. so sodium is kept immersed in kerosene.