Which one among the following metals is not stored under oil?

  1. A. Sodium
  2. B. Rubidium
  3. C. Potassium
  4. D. Lithium

Correct Answer: D. Lithium

Explanation

Lithium is the lightest metal and floats on kerosene oil; therefore, it is typically wrapped in paraffin wax instead of being stored under oil[cite: 1].

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