Which one of the following is the highest reactive metal?

This question was previously asked in
UKPSC Combined Upper PCS (Prelims) Exam (General Studies) Official Paper-I (Held On: 14 Jul, 2024)
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  1. Sodium
  2. Potassium
  3. Calcium
  4. Iron

Answer (Detailed Solution Below)

Option 2 : Potassium
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The correct answer is option 2.
Key Points
  • Potassium (K) is more reactive than sodium (Na), calcium (Ca), and iron (Fe). Hence, option 2 is correct.
  • Reactivity increases down the group in the alkali metals (Group 1 of the Periodic Table).
  • Order of reactivity: Potassium > Sodium > Calcium > Iron
  • Potassium reacts violently with water, producing potassium hydroxide and hydrogen gas, often with flame or explosion.
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