Question

Write the name, stereochemistry and magnetic behaviour of the following : (At. nos. Mn = 25, Co = 27, Ni = 28)

(i) K4[Mn(CN)6]
(ii) [CO(NH3)5 Cl]Cl2
(iii) K2 [Ni(CN)2]​

Answer 1

(i) K4[Mn(CN)2] : IUPAC name : Potassium Hexacyano manganate (II)

Geometry : Octahedral

Magnetic behaviour: Paramagnetic (one unpaired electron)

(ii) [CO(NH3)5 Cl]Cl2 :

Name : Pentaammine chlorido cobalt (III) chloride

Shape : Octahedral (∵ Coordination number = 6)

Hybridization : d2sp3 Magnetic behaviour : Diamagnetic (no unpaired electrons)

(iii) K2 [Ni(CN)4] :

Name : Potassium tetracyanonickelate (II)

Shape : Square planar Hybridization : dsp2 (∵ Coordination number = 4)

Hybridization : dsp2 Magnetic behaviour : Diamagnetic