MHT CET 2022 Chemistry question

Identify anionic complex from following

(A)Bis (ethylene diamine) dithiocyanato platinum (IV)
(B)Pentaamminecarbonatocobalt (III) chloride
(C)Pentacarbonyliron (0)
(D)Sodiumhexanitrocobaltate (III)Correct

Answer: (D)

Solution

A complex is anionic if the complex ion carries a net negative charge; such names end in "-ate" for the central metal. (A) : neutral ligands and two with Pt(IV) give a cationic complex (name ends with metal name, no -ate). (B)

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Question ID VK-093831