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In the figure showing a Zn rod dipped in solution, which feature best indicates that the zinc electrode is acting as an anode? 
APresence of $Zn^{2+}$ ions near the rod due to metal atoms entering solution
BDeposition of copper metal on the zinc rod
CAbsence of any charge separation around the rod
DConversion of sulfate ions into zinc atoms on the rod
Answer & Solution
Correct answer: A. Presence of $Zn^{2+}$ ions near the rod due to metal atoms entering solution
At the anode, oxidation occurs. The figure and notes show zinc atoms leaving the rod as $Zn^{2+}$, so the appearance of $Zn^{2+}$ ions near the rod indicates anodic behavior. Deposition of metal would instead suggest reduction at a cathode.
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