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Question

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


  1. Gold

  2. Aluminium

  3. Iron 

  4. Lithium 


Solution

The correct option is D

Lithium 


Metals are usually very hard but alkali metals (lithium, sodium, potassium) are so soft that they can be cut with a knife. This is because they have very low densities. 

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