Which of the following metals is the most reactive according to the activity series?

• A. Potassium (K)
• B. Copper (Cu)
• C. Silver (Ag)
• D. Zinc (Zn)

Answer: (A)

Verified step by step guidance

1. Understand that the activity series is a list of metals ranked by their reactivity, from most reactive to least reactive.
2. Recall that metals higher in the activity series tend to lose electrons more easily and react more vigorously with substances like water and acids.
3. Identify the metals given in the problem: Potassium (K), Copper (Cu), Silver (Ag), and Zinc (Zn).
4. Compare their positions in the activity series: Potassium is an alkali metal known for very high reactivity, Zinc is moderately reactive, while Copper and Silver are much less reactive and are found near the bottom of the series.
5. Conclude that Potassium (K), being an alkali metal and placed highest among the options, is the most reactive metal according to the activity series.