Valence bond theory: hybridisation and magnetism

28 questions on Valence bond theory: hybridisation and magnetism from the Coordination Compounds chapter: 6 NEET level, 11 JEE Main, 11 JEE Advanced. Each one opens with its answer and solution.

• The central metal hybridisation and the type of complex for the low-spin complex [Fe(CN)6]^4- are: NEET level
• Taking [NiCl4]^2- to be tetrahedral (weak-field Cl-), which statement is correct? NEET level
• Assume [Ni(CN)4]^2- is square planar because CN- is a strong-field ligand. Its hybridisation and magnetic behaviour are: NEET level
• F- is a weak-field ligand, so [CoF6]^3- is high spin. The number of unpaired electrons and the hybridisation of Co in this ion are: NEET level
• The number of unpaired electrons in the low-spin octahedral complex [Mn(CN)6]^3- is: NEET level
• The complex ion [Zn(NH3)4]^2+ is best described as: NEET level
• Using the spin-only formula, the hybridisation and magnetic moment of [Cr(H2O)6]^3+ (octahedral, Cr = 24) are respectively: JEE Main level
• F- is a weak-field ligand, so the octahedral complex [MnF6]^3- is high spin. Calculate its spin-only magnetic moment in BM (answer to two decimals). JEE Main level
• Match the complex ion (List I) with its hybridisation and spin-only magnetic moment (List II). Assume [Ni(CN)4]^2- is square planar, [NiCl4]^2- is tetrahedral a... JEE Main level
• Assertion: [Ni(CN)4]^2- is diamagnetic whereas [NiCl4]^2- is paramagnetic. Reason: The strong-field CN- forces the 3d^8 electrons of Ni^2+ to pair up and gives ... JEE Main level
• Which of the following are inner-orbital (d^2sp^3) octahedral complexes? (Assume F- and NH3 on Ni^2+ are not strong enough to pair electrons.) JEE Main level
• Among [Fe(CN)6]^3-, [FeF6]^3- (F- weak-field), [Fe(CN)6]^4- and low-spin [Co(NH3)6]^3+, the largest spin-only magnetic moment is shown by: JEE Main level
• Assuming square planar geometry for [PtCl4]^2-, which ion has the same hybridisation of the central metal as [PtCl4]^2-? JEE Main level
• The tetrahedral ion [FeCl4]^- (Cl- weak-field) has which hybridisation and spin-only magnetic moment? JEE Main level
• Which of the following are diamagnetic? (Use [Ni(CN)4]^2- square planar, [NiCl4]^2- tetrahedral.) JEE Main level
• Which statement about the octahedral ion [Ni(NH3)6]^2+ is correct? JEE Main level
• Three of the following species have the same central-atom hybridisation. Which one is the odd one out? (Assume [Ni(CN)4]^2- is square planar.) JEE Main level
• The compound CoCl3.5NH3 shows molar conductivity of a 1:2 electrolyte. Excess AgNO3 is added to one mole of it. Treating NH3 as strong-field towards Co^3+ (low ... JEE Advanced level
• Dissolving CrCl3.6H2O in water and adding excess AgNO3 to 0.1 mol of one isomer precipitates 0.2 mol of AgCl. Which option gives the correct formula of the isom... JEE Advanced level
• Consider [NiCl4]^2- (tetrahedral), [Ni(CN)4]^2- (square planar), [Ni(NH3)6]^2+ (octahedral) and Ni(CO)4. Which two have the same NON-ZERO spin-only magnetic mom... JEE Advanced level
• Find the total number of unpaired electrons in the set: [Fe(CN)6]^3- (low spin), [MnCl4]^2- (tetrahedral, high spin), [Ni(CN)4]^2- (square planar) and [Cr(NH3)6... JEE Advanced level
• Compare [Co(NH3)6]^3+ (low spin) and [CoF6]^3- (high spin, F- weak-field). Which statements are correct? JEE Advanced level
• Which of the following are BOTH paramagnetic and outer-orbital (sp^3d^2) octahedral complexes? (F- weak-field; NH3 is strong enough to pair electrons only on Co... JEE Advanced level
• A cobalt(III) compound of formula CoCl3.4NH3 behaves as a 1:1 electrolyte and gives 1 mol of AgCl per mole with excess AgNO3. Treating NH3 as strong-field on Co... JEE Advanced level
• A compound of formula MCl2(NH3)2 is diamagnetic and exists as two distinct isomers with different dipole moments. Which metal ion and geometry fit these facts? JEE Advanced level
• Which of the following has the same spin-only magnetic moment as [Ti(H2O)6]^3+? JEE Advanced level
• Assertion: Ni(CO)4 is paramagnetic with two unpaired electrons because it is a tetrahedral d^8 complex. Reason: In Ni(CO)4 nickel is in the zero oxidation state... JEE Advanced level
• Using the spin-only formula, the ratio mu([FeF6]^3-) / mu([Fe(CN)6]^3-) (high spin for F-, low spin for CN-) is closest to: JEE Advanced level