74 public questions tagged with this topic.
In [Fe(CN)5NO]2−, NO is NO+ (+1), 5 CN− = −5. Overall charge is −2. Thus, x + (−5) + 1 = −2, x = +2, but the sphere’s charge is −2.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Werner's Theory and Definitions - Ligands Coordination Number
Primary valence is the oxidation state. In [CoCl₂(NH₃)4]Cl, the complex [CoCl₂(NH₃)4]+ has a +1 charge (balanced by 1 Cl−). NH₃ is neutral, Cl− is −1. Thus, Co’s oxidation state = +3 (since +3 + 2(−1) = +1).
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Werner's Theory and Definitions - Ligands Coordination Number
In [Ni(NH₃)4]2+, Ni is +2 (oxidation state), and the coordination number is 4. None match here, but [Ni(NH₃)4]2+ fits better conceptually.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Nomenclature of Coordination Compounds
In [Fe(H₂O)4Cl₂], H₂O is neutral, each Cl− is −1. The complex is neutral, so x + 0 + 2(−1) = 0, x = +2.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Optical Isomerism and Linkage Ionisation Solvate
In [Mn(CN)6]4−, each CN− is −1, totaling −6 for 6 ligands. The overall charge is −4. Thus, x + (−6) = −4, so x = +2.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Optical Isomerism and Linkage Ionisation Solvate
x + 0 + 2(−1) = +1 → x = +3.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Optical Isomerism and Linkage Ionisation Solvate
Let the oxidation state of Pt be x. Each Cl− has a charge of −1, and there are 6 Cl− ligands, contributing −6. The overall charge is −2. Thus, x + (−6) = −2, so x = +4.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Geometrical Isomerism in Coordination Compounds
In [Fe(H₂O)5NO]+, NO is NO+ (+1), 5 H₂O are neutral. Charge = +1, so x + 0 + 1 = +1, x = 0 is incorrect; typically Fe is +2 with NO+.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Geometrical Isomerism in Coordination Compounds
In [Ni(CN)4]2−, each CN− is −1, totaling −4 for 4 ligands. The overall charge is −2. Thus, x + (−4) = −2, so x = +2.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Geometrical Isomerism in Coordination Compounds
In [Co(NH₃)3Cl₃], Co is +3 and there are 3 unidentate NH₃ ligands.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Geometrical Isomerism in Coordination Compounds
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
Primary valence is the oxidation state. In [Ni(NH₃)6]Cl₂, NH₃ is neutral, and 2 Cl− balance [Ni(NH₃)6]2+, so Ni is +2.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Crystal Field Theory - CFT and Crystal Field Splitting and CFSE
