Which of the following reacts with cold water vigorously?
  1. Carbon
  2. Sodium
  3. Magnesium
  4. Sulphur

Correct Answer: (b) Sodium

Explanation: Sodium is a very reactive metal, so it reacts violently even with cold water.

[Note: The vigour (or intensity) of reaction of a metal with water depends on its chemical reactivity.] 

Updated on: 31-Jan-2023


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