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Question


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


Options:
A .   Gold
B .   Aluminium
C .   Magnesium
D .   Lithium 
Answer: Option D
:
D

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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