Select the correct formula of chloropenta-aqua- chromium (iii) chloride.

Explanation

'Chloro' in the name suggests the presence of one chlorine in the ligand complex, Penta (5) aqua (H2O) shows that there are five water ligands attached to the central metal atom (chromium) as well. The (iii) next to chromium represents the charge on the chromium ion. So far we are able to form [Cr(H2O)5Cl]. This is a cationic complex with a net charge of +2., so the anion must have a net charge of -2. This condition is fulfilled by B, which shows two chloride ions attached to the cationic complex.The following neutral ligands are assigned specific names in coordination compounds: NH3 (ammine), H2O (aqua or aquo), CO (carbonyl), and NO (nitrosyl). After the ligands are named, the name of the central metal atom is written. If the complex has an anionic charge associated with it, the suffix '-ate' is applied.The ligands are always written before the central metal ion in the naming of complex coordination complexes.When the coordination center is bound to more than one ligand, the names of the ligands are written in an alphabetical order which is not affected by the numerical prefixes that must be applied to the ligands.When there are many monodentate ligands present in the coordination compound, the prefixes that give insight into the number of ligands are of the type: di-, tri-, tetra-, and so on.When there are many polydentate ligands attached to the central metal ion, the prefixes are of the form bis-, tris-, and so on.The names of the anions present in a coordination compound must end with the letter 'o', which generally replaces the letter 'e'. Therefore, the sulfate anion must be written as 'sulfato' and the chloride anion must be written as 'chlorido'.The following neutral ligands are assigned specific names in coordination compounds: NH3 (ammine), H2O (aqua or aquo), CO (carbonyl), and NO (nitrosyl).After the ligands are named, the name of the central metal atom is written. If the complex has an anionic charge associated with it, the suffix '-ate' is applied.When writing the name of the central metallic atom in an anionic complex, priority is given to the Latin name of the metal if it exists (with the exception of mercury).The oxidation state of the central metal atom/ion must be specified with the help of Roman numerals that are enclosed in a set of parentheses.If the coordination compound is accompanied by a counter ion, the cationic entity must be written before the anionic entity.