Sodium and Potassium are stored in kerosene because are highly reactive metals. when react with H2O or moisture they starts burning violently. As there is moisture in the atmosphere, so to prevent it from reacting these two metal are stored in kerosene oil.
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I think Sodium and potassium metals are very reactive because they react with oxygen and water easily.A lot of heat is produced in the reaction so sodium and potassium always stored in kerosene
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