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Which of the following cannot be cut by a knife ?
1. Sodium
2. Potassium
3. Lithium
4. Carbon

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Correct Answer - Option 4 : Carbon

Sodium, Potassium and Lithium are very soft metal can be very easily cut with a knife, just like wax.

  • These metals have large size and only 1 electron in their valence shell, due to this the atomic bonding is quite weak.
  • Also, these metals have body centred cubic structure that has a lot of empty space and this makes metallic bond weak.
  • Hence, these can be easily cut using a knife.

  • Carbon is hard non-metal it cannot be cut easily with a knife as they have stronger covalent bonds.

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