9 public questions tagged with this topic.
Each ethane-1,2-diamine (en) is bidentate (2 donor atoms), and each H₂O is unidentate. In [Ni(en)2(H₂O)2]2+, 2 en (4 atoms) + 2 H₂O = 6.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Werner's Theory and Definitions - Ligands Coordination Number
In [Ni(NH₃)4Cl₂]Cl₂, the 2 Cl− ions outside the coordination sphere are ionizable and precipitate as AgCl, while the 2 inside are ligands. Thus, 2 moles form.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Werner's Theory and Definitions - Ligands Coordination Number
Ni₂+ with 2 en ligands (4 donor atoms). EAN = 28 − 2 + 2 × 4 = 34.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Geometrical Isomerism in Coordination Compounds
[Ni(NH₃)2(H₂O)2Cl₂] (octahedral, [Ma₂b2c2]) has 3 geometrical isomers.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Geometrical Isomerism in Coordination Compounds
Ni₂+ (d8) in [Ni(H₂O)6]2+ (octahedral) with weak field H₂O is high spin (t2g6 eg2), 2 unpaired electrons. Magnetic moment = √[2(2+2)] = √8 ≈ 2.83 BM.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Colour and Magnetic Properties and Stability and Importance
Ni₂+ (d8) in [Ni(NH₃)6]2+ (octahedral) with NH₃ (moderate field) is high spin: t2g6 eg2, giving 2 unpaired electrons.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Bonding - Valence Bond Theory and Hybridisation
[Ni(NH₃)4]2+ (Ni₂+, d8) with 4 ligands is square planar, using dsp2 hybridization.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Bonding - Valence Bond Theory and Hybridisation
[Ni(en)2]2+ (Ni₂+, d8) with 2 bidentate en (4 donor atoms) is square planar, using dsp2 hybridization.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Bonding - Valence Bond Theory and Hybridisation
[Ni(H₂O)4]2+ (Ni₂+, d8) with 4 ligands adopts square planar geometry due to dsp2 hybridization.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Bonding - Valence Bond Theory and Hybridisation
