Question

What is the colour and hybridisation of k4(co(no2)6)?

Answer 1

Strong ligand as NH3<No2<CN- <CO. And from hybridize orbital new orbitals are formed according to their structure.. So, in [Cr(CN)6]3-  ...

Answer 2

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It’s yellow (pictured below).

The IUPAC name for this ionic compound is potassium hexanitritocobaltate(III), but the common name is potassium cobaltinitrite.