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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.  

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