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Chemistry Question on coordination compounds

IUPAC name of Na3[Co(NO2)6]Na_3 [Co (NO_2 )_6 ] is

A

sodium cobaltinitrite

B

sodium hexanitritocobaltate (III)(III)

C

sodium hexanitrocobalt (III)(III)

D

sodium hexanitritocobaltate (II)(II)

Answer

sodium hexanitritocobaltate (III)(III)

Explanation

Solution

The IUPAC name of Na3[Co(NO2)6]Na _{3}\left[ Co \left( NO _{2}\right)_{6}\right] is sodium hexanitrocobaltate (III)