What is the oxidation state of cobalt in $[\mathrm{Co}(\mathrm{NH}{}_3){}_5\mathrm{Cl}]{}^{2+}$?

More questions on Terminology, ligands and denticity, EAN

• The denticity of the oxalate ion, C2O4^2-, when it chelates a metal ion is NEET level
• Which of the following is an ambidentate ligand? NEET level
• The coordination number of iron in K4[Fe(CN)6] is NEET level
• The correct IUPAC name of K3[Fe(CN)6] is NEET level
• Use EAN = Z - (oxidation state) + 2x(number of ligands, all monodentate). The EAN of iron (Z=26) in [Fe(CN)6]^4- is NEET level
• Using EAN = Z - (oxidation state) + 2x(number of monodentate ligands), and the nearest noble gas being krypton (Z=36), which complex ion has... JEE Main level