Reactivity is the ability of the atom or the element to undergo chemical changes. Sodium is highly reactive and is stored under kerosene oil. Thus, option C is correct.
Reactivity is the capacity of the element to form a new substance by undergoing chemical reactions. They are easily able to displace another element from reactions. Group I, alkali metals are highly reactive elements and are kept away from water and air.
Sodium is an alkali metal that has to be kept under kerosene oil as they are highly reactive with oxygen and water and releases large amounts of heat, and are exothermic reaction. On the other hand, kerosene is a hydrocarbon and does not react with a sodium atom.
Therefore, sodium is highly reactive and is stored under oil.
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