MHT CET Medical202621 April 2026Morning ShiftChemistryCoordination CompoundsActual
Identify the anionic sphere complex from following.
Options
- ATriamminetrinitrocobalt(III)
- BTetramminecopper(II) ion
- CSodium hexanitrocobaltate(III)
- DPentacarbonyliron(0)
Correct answer
C. Sodium hexanitrocobaltate(III)
Step-by-step solution
An anionic sphere complex is a coordination compound in which the complex ion (coordination sphere) carries a net negative charge. Triamminetrinitrocobalt(III) is [Co(NH₃)₃(NO₂)₃] . The net charge on the complex is +3 + 3(0) + 3(-1) = 0 . It is a neutral complex. Tetramminecopper(II) ion is [Cu(NH₃)₄]²⁺ . The net charge on the complex is +2 + 4(0) = +2 . It is a cationic complex. Sodium hexanitrocobaltate(III) is Na₃[Co(NO₂)₆] . The complex ion is [Co(NO₂)₆]³⁻ . The net charge on the complex sphere is +3 + 6(-1) =