Q39 / 150 · MHT CET 2026 (19 April Shift 2) · Chemistry
Which from following coordinate complexes contains neutral ligand ?
- Correct answerAPentacarbonyliron (0)
- BHexacyanoferrate (II) ion
- CTrioxalatocobaltate (III) ion
- DSodium hexanitrocobaltate (III)
Solution
Pentacarbonyliron (0) has the formula $[Fe(CO)_5]$. The ligand present is carbonyl (CO), which is a neutral molecule.
Hexacyanoferrate (II) ion has the formula $[Fe(CN)_6]^{4-}$. The ligand is cyanide ($CN^-$), which is an anionic ligand.
Trioxalatocobaltate (III) ion has the formula $[Co(C_2O_4)_3]^{3-}$. The ligand is oxalate ($C_2O_4^{2-}$), which is an anionic ligand.
Sodium hexanitrocobaltate (III) has the formula $Na_3[Co(NO_2)_6]$. The ligand is nitro ($NO_2^-$), which is an anionic ligand.
Therefore, only pentacarbonyliron (0) contains a neutral ligand.
Answer: Pentacarbonyliron (0)
Hexacyanoferrate (II) ion has the formula $[Fe(CN)_6]^{4-}$. The ligand is cyanide ($CN^-$), which is an anionic ligand.
Trioxalatocobaltate (III) ion has the formula $[Co(C_2O_4)_3]^{3-}$. The ligand is oxalate ($C_2O_4^{2-}$), which is an anionic ligand.
Sodium hexanitrocobaltate (III) has the formula $Na_3[Co(NO_2)_6]$. The ligand is nitro ($NO_2^-$), which is an anionic ligand.
Therefore, only pentacarbonyliron (0) contains a neutral ligand.
Answer: Pentacarbonyliron (0)
Hence, the correct answer is option: 'A'.