MHT CET Medical202625 April 2026Evening ShiftChemistryCoordination CompoundsActual
Which of the following coordinate complexes contains one or more neutral ligand / ligands in its coordination sphere?
Options
- APotassium trioxalatoaiuminate(III)
- BPentaammineaquacobalt(III) iodide
- CSodium hexanitrocobaltate(III)
- DHexacyanoferrate(II) ion
Correct answer
B. Pentaammineaquacobalt(III) iodide
Step-by-step solution
Let us analyze the ligands present in the coordination sphere of each complex: Potassium trioxalatoaluminate(III): K₃[Al(C₂O₄)₃] contains oxalato ligands ( C₂O₄²⁻ ), which are anionic. Pentaammineaquacobalt(III) iodide: [Co(NH₃)₅(H₂O)]I₃ contains ammine ( NH₃ ) and aqua ( H₂O ) ligands, both of which are neutral molecules. Sodium hexanitrocobaltate(III): Na₃[Co(NO₂)₆] contains nitro ligands ( NO₂⁻ ), which are anionic. Hexacyanoferrate(II) ion: [Fe(CN)₆]⁴⁻ contains cyano ligands ( CN⁻ ), which are anionic. Thus, pe