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Chemistry Hard CSS FPSC Uploaded: 14 Jul 2026

Which element in Group 1 of the periodic table reacts most vigorously with water?

  • A Lithium
  • B Sodium
  • C Caesium
  • D Potassium
Correct Answer: Option C — Caesium
Explanation:
Caesium the heaviest stable Group 1 alkali metal reacts most vigorously with water due to its large atomic radius and low ionisation energy resulting in an explosive reaction.
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