Question

Which of the following is the correct formulation of the entity according to IUPAC?

(a) (Co(CN)6)^3-

(b) [Co(CN)6]^3-

(c) [Co (CN)6]^3-

(d) [Co(CN)6]^-3

This question was addressed to me in an interview for internship.

Query is from Nomenclature of Coordination Compounds topic in chapter Coordination Compounds of Chemistry – Class 12

Answer 1

The correct answer is (b) [Co(CN)6]^3-

The best explanation: The formula of the coordination entity should be enclosed within square brackets and there should be no space between the ligand and central metal. The number is written before the sign while indication the charge of the complex ion.