Choose the correct IUPAC name for the following complex.[Cr(NH3)4Cl2]Cl
Correct answer: B. Tetraamminedichlorochromium (III) chloride
- A. Trichlorotetra amine chromium (III)
- B. Tetraamminedichlorochromium (III) chloride
- C. Dichloro Tetra ammonia chromium (III) chloride
- D. Dichlorotetra amine chromate (III) chloride
Explanation
The correct IUPAC name for the complex [Cr(NH3)4Cl2]Cl is Tetraamminedichlorochromium (III) chloride. The complex contains four ammine (NH3) ligands and two chloro (Cl) ligands, which are named in alphabetical order as 'tetraammine' and 'dichloro'. The oxidation state of the central metal ion, chromium, is +3, denoted as (III). The name ends with 'chloride' to indicate the presence of the counter ion Cl- outside the coordination sphere. Other options do not follow the IUPAC rules for naming coordination complexes, either by using incorrect prefixes, separating terms incorrectly, or misnaming the metal.
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Transition elements are identified by their partially filled d subshells in atoms or common ions. The topic covers the electronic structure of d-block elements, including the filling order of 4s and 3d orbitals, variable oxidation states and the distinction between transition elements and elements with completely filled d subshells.
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