Which one of the following is the highest reactive metal?

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(b) Potassium — Potassium is the most reactive metal because it has a lower ionization energy than sodium and is more electropositive. This means its easier to remove an electron from potassium, potassium reacts vigorously with air and water, producing a large amount of heat.

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(A) Sodium

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(C) Calcium

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(D) Iron

Which one of the following is the highest reactive metal?

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