Multiple choice The IUPAC name of Na3 [CO (NO2)6] is Sodium Cobaltinitrite Sodium hexanitro cobalt (III) Sodium hexanitro cobaltate (III) Sodium hexa nitrito cobaltate (III) Reveal answer Fill a bubble to check yourself C Correct answer Explanation The IUPAC name for Na3[Co(NO2)6] is sodium hexanitrocobaltate(III). The metal is in the anionic complex, so it ends in -ate.