The correct structure of complex having IUPAC name sodium hexanitrocobaltate (III) is
Q.1 (v) The correct structure of complex having IUPAC name sodium hexanitrocobaltate (III) is
A. Na3[Co(NO2)5]
B. Na4[Co(NO2)6]
C. Na3[Co(NO2)6]
D. Na4[Co(NO2)5]
1 answer
Best answer
Answer: C. Na3[Co(NO2)6]
Answer: (c) Na3[Co(NO2)6]
"Hexanitro" means six NO2− ligands and "cobaltate(III)" means Co3+ in an anionic complex. Charge on the complex ion = +3 + 6(−1) = −3, so three Na+ ions are needed: Na3[Co(NO2)6].
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· 29 Oct 2026
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