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[Cr(NH₃)4ClBr]+ (octahedral, [Ma₄bc]) has 2 geometrical isomers: cis (Cl and Br adjacent) and trans (Cl and Br opposite).
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Geometrical Isomerism in Coordination Compounds
Cr₂+ with 5 NH₃ and 1 Cl− (6 ligands). EAN = 24 − 2 + 2 × 6 = 34.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Crystal Field Theory - CFT and Crystal Field Splitting and CFSE
In [Co(H₂O)6]SO₄, H₂O is neutral, and SO₄₂− has a −2 charge. The complex [Co(H₂O)6]2+ balances this, so Co’s oxidation state is +2.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Crystal Field Theory - CFT and Crystal Field Splitting and CFSE
[Ni(H₂O)6]2+ (Ni₂+, d8) in an octahedral field undergoes d-d transitions, absorbing visible light (green color).
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Crystal Field Theory - CFT and Crystal Field Splitting and CFSE
Tungsten (W) has the highest enthalpy of atomization in the 5d series due to strong metallic bonding.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Actinoids and Comparison of Lanthanoids and Actinoids
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