Problem
3. Circle the most reactive element and underline the least reactive element: Zn \( \mathrm{Hg} \) \( \underline{K} \) Which of these elements will have a reaction when added to \( \mathrm{FeCl}_{3} \) ? (Circle all answers that apply) a. \( \mathrm{Na} \) b. \( \mathrm{Cu} \) c. \( K \) d. \( \mathrm{Zn} \)
Solution
Step 1 ：\( \text{Most reactive element: } \circled{K} \)
Step 2 ：\( \text{Least reactive element: } \underline{\mathrm{Hg}} \)
Step 3 ：\( \text{Reactions with FeCl}_3: \mathrm{Na}, K, \mathrm{Zn} \)
