Why is sodium kept immersed in kerosene oil?

(A) : Sodium metals is stored in kerosene (R): The density of sodium is less than water

Sodium and potassium are stored in kerosene. Why?

The focal length of concave mirror is f . Is there any change in focal length when it is completely immersed in water ? If not why ?

Why is sodium fire in the laboratory not extinguished by water ?

Why sodium peroxide is used in submarines?

Wich objects float in kerosene ?

Why is sodium hydroxide called caustic soda?