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

AcademicChemistryNCERTClass 8

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 10-Oct-2022 13:23:58