Question

which two mtals that cannot be stored either i air or under water

Answer 1

Sodium and potassium are kept in submerged oil so as to protect it from oxygen in the air and water.

Answer 2

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Here is ur answer...................

Lithium, sodium and potassium are all soft metals that are easily cut with a scalpel or knife. The freshly cut surface is a shiny, silver colour, but this tarnishes quickly to a dull grey as the metal reacts with oxygen and water in the air. Pieces of such metals are stored in oil to prevent these reactions.

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