(a) A black precipitate forms when H2S is added to an aqueous solution of a Cu(II) salt. The precipitate redissolves when Na2S is added to the solution. Suggest a reason for this observation.
(b) In the presence of small amounts of water, the reaction of SO2 with CsN– leads to Cs2S205 as a by-product in the formation of Cs[SO2N3]. Suggest how the formation of Cs2S205 arises.
(c) The complex ion [Cr(Te4)3 ]3- possesses a AAAA- conformation. Using the information in Box 19.3, explain (i) to what the symbols A and A refer, and (ii) how the Δλλλ-conformation arises.
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