MHT CET Chemistry Question (2026) — Solution

Step-by-step 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)