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Question

What is the IUPAC name of Na3[Ag(S2O3)2]?

A
Sodium dithiosulphatoargentate (I)
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B
Sodium bis(thiosulphato)argentate (I)
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C
Sodium di(thiosulphato) silver (I)
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D
Sodium bis(thiosulphato) silver (I)
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Solution

The correct option is A Sodium dithiosulphatoargentate (I)
There are two of the thiosulphate S2O23 ligands. Hence, we need to use di. The cation is Sodium - which almost always exists in its +1 oxidation state in compounds.

The anion is [Ag(S2O3)2]3.With an anionic charge of -3, silver is definitely in its +1 oxidation state. According to the IUPAC rules, we should have argentate (I) to denote the silver (+1). Hence, the IUPAC name is: Sodium dithiosulphatoargentate (I)

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