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Q: Which of the following groups of metals are so soft that they can be cut with a knife and have low densities and low melting point?
  • A. Arsenic, Antimony, Bismuth
  • B. Beryllium, Calcium, Magnesium
  • C. Lithium, Sodium, Potassium
  • D. Germanium, Gallium, Indium
Correct Answer: Option C - Lithium, Sodium, Potassium are alkali group metals. These are so soft that they can be cut with a knife, they also have low density and low melting point.
C. Lithium, Sodium, Potassium are alkali group metals. These are so soft that they can be cut with a knife, they also have low density and low melting point.

Explanations:

Lithium, Sodium, Potassium are alkali group metals. These are so soft that they can be cut with a knife, they also have low density and low melting point.