Which of the following metals can be cut with a knife?

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Sodium is a soft alkali metal that can be easily cut with a knife, revealing a silvery surface that tarnishes quickly in air. Potassium is also soft. Iron, zinc, and copper are much harder. Alkali metals have low density and low melting points. They are stored under kerosene to prevent reaction with moisture and oxygen.

Which of the following metals can be cut with a knife? MCQ with Answer and Explanation

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