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Hi Chemistry enthusiasts!

I am working on my scholarship exam practice but I am considered myself as a newbie so I would like to hear your opinion :)

From (1)-(4) below choose the metal that does not deposit silver (Ag) on the surface when immersed in aqueous silver nitrate. (1) Cu (2) Fe (3) Pt (4) Zn

The answer is Pt but I am not sure how I can solve this problem without any other given information such as electrode potential etc. Please advise.

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  • $\begingroup$ You just have to know that Ag and Pt are the only noble metals over all 5 elements. Thus Pt is the only logical choice. (Think what metals "good" jewelry is made from...) $\endgroup$ – MaxW Apr 12 at 19:45
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You do need the electromotive series or reactivity series to answer that question. If you will not have access to it during such exams, you'll need to memorize the order of some common elements, and to understand the arrangement of the Periodic Table.

The most reactive metals are at the bottom left of the table, low in Group I. The "noble" or coinage metals are clustered near the center, with reactivity generally decreasing within a column. E.G., Au is less reactive than Ag, which is less reactive than Cu.

Later, you may learn about the electron configuration of atoms and how that determines reactivity, but at this point, knowing the reactivity series would get you though the test.

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  • $\begingroup$ Thank you for pointing it out so clearly! Now I know where I should be focusing on next :) $\endgroup$ – Trey Anupong Apr 13 at 6:05

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