Some zinc-containing batteries use an unusual tetroxide of this element containing cations in the plus-one and plus-three oxidation states. For 10 points each:
[10m] Name this element whose plus-one cation is central in a diamine complex that precipitates out upon acting as an oxidizing agent. This element’s nitrate is used as a test for chloride ions.
ANSWER: silver [or Ag]
[10e] The formation of a “silver mirror” is a positive result in Tollens’ test, which distinguishes types of this functional group defined by a C–O double bond.
ANSWER: carbonyl [accept aldehyde or ketone]
[10h] Silver(I) (“silver one”) catalysts are a common choice for this reaction that starts with a diazoketone. This reaction’s ketene intermediate can undergo a two-plus-two cycloaddition to form a four-membered ring.
ANSWER: Wolff rearrangement [prompt on rearrangement]
<WashU B, Chemistry>