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Crystal field theory: splitting, CFSE, spectrochemical series

27 questions on Crystal field theory: splitting, CFSE, spectrochemical series from the Coordination Compounds chapter: 5 NEET level, 11 JEE Main, 11 JEE Advanced. Each one opens with its answer and solution.

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In an octahedral complex of a d^5 metal ion with weak-field ligands (high spin), the electronic configuration is NEET level
Assume H2O is a weak-field ligand here. The number of unpaired electrons in [Fe(H2O)6]^2+ is NEET level
Which of the following ligands is the strongest field ligand (largest Delta_o)? NEET level
Using CFSE = (-0.4 n_t_2g + 0.6 n_e_g)Delta_o and ignoring pairing energy, the CFSE of an octahedral d^3 ion is NEET level
For the same metal ion and ligands, the tetrahedral crystal field splitting Delta_t is related to the octahedral splitting Delta_o approximately by NEET level
Use mu = sqrtn(n+2) BM. Cyanide is a strong-field ligand, so [Fe(CN)6]^3- is low spin. Its spin-only magnetic moment is JEE Main level
Treat H2O as a weak-field ligand and ignore pairing energy. The CFSE of [Mn(H2O)6]^2+, in units of Delta_o, is JEE Main level
Take [Co(NH3)6]^3+ to be low spin and ignore pairing energy. Its CFSE in units of Delta_o is JEE Main level
Which of the following octahedral aqua ions is expected to be colourless? JEE Main level
Among [CoF6]^3-, [Co(NH3)6]^3+, [Co(en)3]^3+ and [Co(CN)6]^3-, the complex that absorbs light of the longest wavelength is JEE Main level
Using CFSE_tet=(-0.6 n_e+0.4 n_t_2)Delta_t and ignoring pairing energy, the CFSE of the tetrahedral complex [NiCl4]^2- is JEE Main level
Assertion: Tetrahedral complexes of first-row transition metals are almost always high spin. Reason: For the same metal and ligands Delta_t approx tfrac49Delta_... JEE Main level
Take [NiCl4]^2- as tetrahedral and [Ni(CN)4]^2- as square planar. Their spin-only magnetic moments (BM) are respectively JEE Main level
Assume weak-field ligands give high spin, cyanide gives low spin, and take [Co(NH3)6]^3+ as low spin. Which complex has the highest spin-only magnetic moment: [... JEE Main level
Match the octahedral complex in Column I with its d-electron arrangement in Column II (cyanide is strong field and water is weak field). Column I: P [Cr(H2O)6]^... JEE Main level
Which of the following octahedral complexes is expected to have the largest crystal field splitting Delta_o? JEE Main level
Using CFSE =(-0.4 n_t_2g+0.6 n_e_g)Delta_o (pairing energy ignored; H2O weak field, NH3 on Co(III) low spin), which statements are correct? JEE Advanced level
Ignoring pairing energy, which of the following complexes have zero crystal field stabilisation energy? (The tetrahedral complex is high spin.) JEE Advanced level
Assertion: [NiCl4]^2- is paramagnetic whereas [Ni(CN)4]^2- is diamagnetic. Reason: Both complexes have the same geometry but chloride and cyanide differ in fiel... JEE Advanced level
Match each complex in Column I with its spin-only magnetic moment in Column II (high spin for water, low spin for cyanide; [Cu(NH3)4]^2+ has one unpaired electr... JEE Advanced level
For a d^8 ion such as Ni(II) with the same ligands, use Delta_t=tfrac49Delta_o and ignore pairing energy. By how much (in units of Delta_o) is the octahedral CF... JEE Advanced level
Which of the following complexes are diamagnetic? (Cyanide is strong field; [Co(NH3)6]^3+ is low spin; [Ni(CN)4]^2- is square planar and [NiCl4]^2- is tetrahedr... JEE Advanced level
Which of the following comparisons of crystal field splitting are correct? JEE Advanced level
Which of the following statements about colour and absorption are correct? JEE Advanced level
Which of the following statements about tetrahedral crystal fields are correct? JEE Advanced level
The tetrahedral complex [CoCl4]^2- is high spin. Using CFSE_tet=(-0.6 n_e+0.4 n_t_2)Delta_t, ignoring pairing energy, and Delta_t=tfrac49Delta_o, calculate its ... JEE Advanced level
Mohr's salt, FeSO4.(NH4)2SO4.6H2O, contains the octahedral ion [Fe(H2O)6]^2+. Treating water as a weak-field ligand (high spin), calculate the spin-only magneti... JEE Advanced level