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      Question

      Which of the following cannot be cut by a knife?

      A Carbon Correct Answer Incorrect Answer
      B Potassium Correct Answer Incorrect Answer
      C Lithium Correct Answer Incorrect Answer
      D Sodium Correct Answer Incorrect Answer

      Solution

      Sodium, Potassium and Lithium are very soft metal can be very easily cut with a knife, just like wax. Carbon is hard non-metal it cannot be cut easily with a knife as they have stronger covalent bonds. Β 

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