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Question

Metals are generally hard. Which of the following metals is an exception and can be cut with a knife?


A

Iron

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B

Sodium

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C

Gold

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D

Magnesium

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Solution

The correct option is B

Sodium


Explanation of correct answer:

Option B Sodium

  • All metals are hard except Lithium, Potassium, and Sodium which are soft and can be cut with a knife.
  • Sodium is the second least dense metal after Lithium.
  • It is a silvery-white metal with a waxy appearance.
  • They have bright and shiny surfaces on the first cut but it quickly becomes dull as Sodium reacts with Oxygen in the air.
  • Since Sodium is very reactive, it can be stored in kerosene.

Explanation of incorrect answer:

Option A Iron

  • Iron is a hard and dense metal that is malleable and ductile.
  • Therefore, it can't be cut with a knife.
  • Hence option A is incorrect

Option C Gold

  • Gold is a hard and dense metal that is malleable and ductile.
  • Therefore, it can't be cut with a knife.
  • Hence option C is incorrect

Option D Magnesium

  • Magnesium is a hard and dense metal that is malleable and ductile.
  • Therefore, it can't be cut with a knife.
  • Hence option D is incorrect

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