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Which of the following metal can be cut down with the help of knife?


1. Sodium
2. Potassium
3. Gallium
4. All of the above

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Correct Answer - Option 4 : All of the above

Concept:

Metal: 

  • Metal is such a kind of electropositive element that usually has a shiny surface.
  • It is generally good conductors of electricity & heat.
  • Metal can be fused, melted, or hammered into thin sheets.
  • Out of 118 elements, the first 94 occur naturally on Earth, and the remaining 24 are synthetic elements.
  • All metals exist in a solid state at room temperature.
  • Mercury is the only metal that exists in the liquid state at room temperature.
  • Metals are the elements that have loosely bound electrons they can give up easily.
  • They generally lie on the left side of the periodic table. 

Explanation:

  • Metals which are less dense or soft in other words are easy to cut with the help of a knife.
  • The metals which have low boiling points are easily melted even with the heat of the knife cutting them.
  • They are generally solid at room temperatures.
  • The metals which can be easily cut with a knife are the alkali metals sodium, potassium, lithium, Rubidium, Cesium.
  • All alkali metals are soft metals and can be cut with a knife.
  • Hence, the correct option is All of the above.

  •  Alkali metals lie in group I of the periodic table.
  • They are the most metallic elements. Cesium is the most metallic in nature.
  • Francium is a lab-made element.
  • Sodium and Potassium are highly reactive metals and react vigorously with the oxygen, carbon dioxide, and moisture present in the air such that it may even cause a fire. To prevent this explosive reaction, Sodium is kept stored in kerosene oil and potassium kept wrapped in paraffin wax.

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