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Coordination Compounds · Question 2

JEE Advanced 2026 Paper 2NumericalMedium📈 Topic in 17% papers+4
1

Consider that the coordinating atoms of the ligands in cis-[Co(NH3)4Cl2]Cl and mer-[Co(NH3)3Cl3] octahedral complexes are at the vertices of an octahedron. The sum of total number of the triangular faces in both the complexes having one N atom and two Cl atoms at their corners is .

Answer

6

Solution

Each face of an octahedron has one vertex from each axis pair ( x, y, z); 8 faces in all.

cis-[Co(NH3)4Cl2]+: the two Cl (say +x, +y) share one edge, which belongs to 2 faces; the third vertex ( z) is N in both. Count = 2.

mer-[Co(NH3)3Cl3]: Cl at +x, -x, +y; N at -y, +z, -z.

Faces with 2 Cl + 1 N: ( x Cl) and (+y Cl) and ( z N): 2 2=4 (choosing -y gives only one Cl).

Total =2+4=6

Answer: 6

JEE Advanced 2026 Paper 2

Keep practising — Coordination Compounds

2

The correct order of the wavelength maxima of the absorption band in the ultraviolet-visible region for the given complexes is

  1. [Co(CN)6]3- < [Co(NH3)6]3+ < [Co(NH3)5(H2O)]3+ < [Co(NH3)5(Cl)]2+
  2. [Co(NH3)5(Cl)]2+ < [Co(NH3)5(H2O)]3+ < [Co(NH3)6]3+ < [Co(CN)6]3-
  3. [Co(CN)6]3- < [Co(NH3)5(Cl)]2+ < [Co(NH3)5(H2O)]3+ < [Co(NH3)6]3+
  4. [Co(NH3)6]3+ < [Co(CN)6]3- < [Co(NH3)5(Cl)]2+ < [Co(NH3)5(H2O)]3+
JEE Advanced 2025 Paper 1
3

The sum of the spin only magnetic moment values (in B.M.) of [Mn(Br)6]3- and [Mn(CN)6]3- is .

JEE Advanced 2025 Paper 2
4

Among the following options, select the option in which each complex in Set-I shows geometrical isomerism and the two complexes in Set-II are ionization isomers of each other. [en = H2NCH2CH2NH2]

  1. Set-I: [Ni(CO)4] and [PdCl2(PPh3)2] Set-II: [Co(NH3)5Cl]SO4 and [Co(NH3)5(SO4)]Cl
  2. Set-I: [Co(en)(NH3)2Cl2] and [PdCl2(PPh3)2] Set-II: [Co(NH3)6][Cr(CN)6] and [Cr(NH3)6][Co(CN)6]
  3. Set-I: [Co(NH3)3(NO2)3] and [Co(en)2Cl2] Set-II: [Co(NH3)5Cl]SO4 and [Co(NH3)5(SO4)]Cl
  4. Set-I: [Cr(NH3)5Cl]Cl2 and [Co(en)(NH3)2Cl2] Set-II: [Cr(H2O)6]Cl3 and [Cr(H2O)5Cl]Cl2 H2O
JEE Advanced 2024 Paper 1
5

Among V(CO)6, Cr(CO)5, Cu(CO)3, Mn(CO)5, Fe(CO)5, [Co(CO)3]3-, [Cr(CO)4]4-, and Ir(CO)3, the total number of species isoelectronic with Ni(CO)4 is . [Given, atomic number: V = 23, Cr = 24, Mn = 25, Fe = 26, Co = 27, Ni = 28, Cu = 29, Ir = 77]

JEE Advanced 2024 Paper 1
6

Among the following complexes, the total number of diamagnetic species is . [Mn(NH3)6]3+, [MnCl6]3-, [FeF6]3-, [CoF6]3-, [Fe(NH3)6]3+, and [Co(en)3]3+ [Given, atomic number: Mn = 25, Fe = 26, Co = 27; en = H2NCH2CH2NH2]

JEE Advanced 2024 Paper 1
7

Among [Co(CN)4]4-, [Co(CO)3(NO)], XeF4, [PCl4]+, [PdCl4]2-, [ICl4]-, [Cu(CN)4]3- and P4 the total number of species with tetrahedral geometry is .

JEE Advanced 2024 Paper 2

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