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Why is sodium kept immersed in kerosene oil?

Q.3.    Why is sodium kept immersed in kerosene oil?

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Sodium is a very reactive metal. It reacts rapidly with the oxygen and thus cannot be kept in air as it will explode. So it is better to store in a liquid. 

Further the density of sodium is less than that of water so it will float on the surface. So water is not a good solvent for the purpose. So sodium is kept in kerosene oil.

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