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. \( \mathrm{Zn} \)

Answer

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Answer

\( \text{Reactions with FeCl}_3: \mathrm{Na}, K, \mathrm{Zn} \)

Steps

Step 1 ：\( \text{Most reactive element: } \circled{K} \)

Step 2 ：\( \text{Least reactive element: } \underline{\mathrm{Hg}} \)

Step 3 ：\( \text{Reactions with FeCl}_3: \mathrm{Na}, K, \mathrm{Zn} \)