Free NEET Chemistry multiple-choice questions on Bonding Theories (VBT & CFT). Attempt each question and reveal the answer with a full explanation.
Which of the following ligands is expected to have the lowest o value in the spectrochemical series? I - F - OH - H 2O In the complex [Ni(H 2O) 6] 2+ , the number of unpaired electrons is: 2 0 4 3 Among the following complexes the one which shows Zero crystal field stabilization energy (CFSE):- [Mn(H2O)6] 3+ [Fe(H2O)6] 3+ [Co(H2O)6] 2+ [Co(H2O)6] 3+ Which of the following has longest C-O bond length? (Free C-O bond length in Co is 1.128 ). Ni(CO)4 [ Co(CO)4 ] [ Fe(CO)4 ] 2 [ Mn(CO)6 ] + Which one of the following ions is not tetrahedral in shape ? [NiCl4] 2- NH4+ BF4- [Cu(NH3)4] 2+ Which of the following complex ions is not diamagnetic ? [Sc(H2O)3(NH3)3] 3+ [Ti(en)2(NH3)2] 4+ [Cr(NH3)6] 3+ [Zn(NH3)6] 2+ For the tetrahedral complex [MnBr4] 2- , the spin only magnetic moment value is [At. no. of Mn = 25] 2.4 1.7 5.9 4.8 The [Co(H2O)6] 2+ ion has three unpaired electrons. The hybridization of Co in [Co(H2O)6] 2+ is d 2sp 3 sp 3 dsp 2 sp 3d 2 The geometry and magnetic behaviour of the complex [Ni(CO)4] are Square planar geometry and paramagnetic Tetrahedral geometry and diamagnetic Square planar geometry and diamagnetic Tetrahedral geometry and paramagnetic What is the correct electronic configuration of the central atom in K4[Fe(CN)6] based on crystal field theory? e 4 ,t 2 2 t 2g 4 ,e g 2 t 2g 6 ,e g 0 e 3 ,t 2 3 Which of the following is the correct order of increasing field strength of ligands to form coordination compounds? SCN - < F - < CN - < C2O4 2- F - < SCN - < C2O4 2- < CN - CN - < C2O4 2- < SCN - < F - SCN - < F - < C2O4 2- < CN - Match List-I with List-II. array ll List-I & List-II (a) [Fe(CN)6] 3- & (i) 5.92 BM (b) [Fe(H2O)6] 3+ & (ii) 0 BM (c) [Fe(CN)6] 4- & (iii) 4.90 BM (d) [Fe(H2O)6] 2+ & (iv) 1.73 BM array Choose the correct answer from the options given below. (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i) (a)-(i), (b)-(iii), (c)-(iv), (d)-(ii) (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii) (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii) The hybridization and shape of the complex [Fe(CO) 5] are: dsp 3 , Trigonal bipyramidal sp 3d , Trigonal bipyramidal d 2sp 3 , Octahedral sp 3d 2 , Octahedral The order of energy absorbed which is responsible for the color of complexes (A) [Ni(H2O)2(en)2] 2+ (B) [Ni(H2O)4(en)] 2+ and (C) [Ni(en)3] 2+ is (C) > (B) > (A) (C) > (A) > (B) (B) > (A) > (C) (A) > (B) > (C) Given below are two statements : Statement I: Both [ Co(NH3)6 ] 3+ and [ CoF6 ] 3- complexes are octahedral but differ in their magnetic behaviour. Statement II: [ Co(NH3)6 ] 3+ is diamagnetic whereas [ CoF6 ] 3- is paramagnetic. In the light of the above statements, choose the correct answer from the options given below: Both Statement I and Statement II are true Both Statement I and Statement II are false Statement I is true but Statement II is false Statement I is false but Statement II is true The correct order of the wavelength of light absorbed by the following complexes is, A. [Co(NH3)6] 3+ B. [Co(CN)6] 3- C. [Cu(H2O)4] 2+ D. [Ti(H2O)6] 3+ Choose the correct answer from the options given below: C < A < D < B B < D < A < C B < A < D < C C < D < A < B Which of the following are paramagnetic? A. [NiCl4] 2- B. Ni(CO)4 C. [Ni(CN)4] 2- D. [Ni(H2O)6] 2+ E. Ni(PPh3)4 Choose the correct answer from the options given below : A, D and E only A and C only B and E only A and D only Match List I with List II : array llll ; & List I; (Complex/ion) & ; & List II; (Shape/geometry) A. & [Pt(Cl2)(NH3)2] & (I) & Octahedral B. & [Co(NH3)6]Cl3 & (II) & Trigonal bipyramidal C. & [NiCl4] 2- & (III) & Square planar D. & [Fe(CO)5] & (IV) & Tetrahedral array Choose the correct answer from the options given below : A-I, B-III, C-IV, D-II A-III, B-IV, C-I, D-II A-III, B-I, C-IV, D-II A-IV, B-I, C-III, D-II The hybridisation of [Cu(NH 3) 4] 2+ is: dsp 2 sp 3 sp 3d 2 d 2sp 3 The correct order of magnetic moments (spin only values in B.M.) is: [Fe(CN) 6] 4- < [MnCl 4] 2- < [CoCl 4] 2- [MnCl 4] 2- < [CoCl 4] 2- < [Fe(CN) 6] 4- [Fe(CN) 6] 4- < [CoCl 4] 2- < [MnCl 4] 2- [Fe(CN) 6] 4- = [MnCl 4] 2- < [CoCl 4] 2- The hybridization of Cr in [Cr(CO) 6] is: d 2sp 3 sp 3d 2 sp 3d dsp 2 The hybridization and shape of [PdCl 4] 2- are: dsp 2 , Square planar sp 3 , Tetrahedral sp 3d , Trigonal bipyramidal d 2sp 3 , Octahedral In the spectrochemical series, which of the following is a 'weak field' ligand but can behave as a 'strong field' ligand with specific metals like Co 3+ ? H 2O I - Cl - F - The crystal field splitting energy for tetrahedral complexes ( t ) is related to octahedral splitting ( o ) by: t = 4 9 o t = 9 4 o t = 1 2 o t = 4 5 o Which of the following statements about Crystal Field Theory is FALSE? The d -orbitals in a tetrahedral field are split into t 2 (lower) and e (higher) energy levels. The d -orbitals in an octahedral field are split into t 2g (lower) and e g (higher) energy levels. Δ t is approximately 4/9 of Δ o . Ligands are treated as point charges. If the Δ o for [Cr(H 2O) 6] 2+ is 13900 cm -1 and P is 23500 cm -1 , the complex is: High spin Low spin Square planar Diamagnetic Which of the following d-orbital electronic configurations will exhibit the strongest Jahn-Teller distortion in an octahedral field? t 2g 6 e g 3 t 2g 3 e g 1 t 2g 3 e g 0 t 2g 6 e g 4 Which of the following is paramagnetic with one unpaired electron? [V(CO) 6] [Cr(CO) 6] [Fe(CO) 5] [Ni(CO) 4] What is the order of energy of d-orbitals in a square planar complex? d x 2-y 2 > d xy > d z 2 > d xz , d yz d x 2-y 2 > d z 2 > d xy > d xz , d yz d xy > d x 2-y 2 > d z 2 > d xz , d yz d z 2 > d x 2-y 2 > d xy > d xz , d yz What is the hybridization of Cu in the square planar complex [Cu(NH 3) 4] 2+ ? dsp 2 sp 3 sp 2d d 2sp 2 Which of the following statements is FALSE concerning the spectrochemical series? H 2O is a stronger field ligand than OH - F - is a stronger field ligand than Cl - NH 3 is a stronger field ligand than en CN - is a stronger field ligand than CO The correct electronic configuration of d 5 ion in a tetrahedral crystal field with t > P (pairing energy) is: e 3 t 2 2 e 2 t 2 3 t 2g 3 e g 2 t 2g 5 e g 0 For a d 4 metal ion in an octahedral field, the difference in CFSE between high-spin and low-spin states is (assuming P is pairing energy): 1.0 o - P 1.2 o - P 0.6 o 2.0 o The magnetic moment of the brown ring complex [Fe(H 2O) 5(NO)]SO 4 is approximately 3.87 BM. This indicates the presence of how many unpaired electrons? 3 1 5 2 What is the correct order of the energies of d-orbitals for a metal ion in a tetrahedral crystal field? d xy , d yz , d xz > d x 2-y 2 , d z 2 d x 2-y 2 , d z 2 > d xy , d yz , d xz d xy , d x 2-y 2 > d yz , d xz , d z 2 d z 2 , d xz > d xy , d yz , d x 2-y 2 The correct order of C-O bond length in the following species is: [V(CO) 6] - > [Cr(CO) 6] > [Mn(CO) 6] + [Mn(CO) 6] + > [Cr(CO) 6] > [V(CO) 6] - [Cr(CO) 6] > [Mn(CO) 6] + > [V(CO) 6] - [V(CO) 6] - > [Mn(CO) 6] + > [Cr(CO) 6] Which of the following d -orbital electronic configurations in an octahedral field would NOT show Jahn-Teller distortion? d 3 (high spin) d 4 (high spin) d 7 (low spin) d 9 Which of the following electronic configurations of a d 5 ion in an octahedral field corresponds to the highest crystal field stabilization energy (CFSE)? t 2g 5 e g 0 t 2g 3 e g 2 t 2g 2 e g 3 t 2g 4 e g 1 The Jahn-Teller effect is NOT observed in which of the following octahedral complexes? High spin d 5 High spin d 4 Low spin d 7 d 9 The complex [NiCl 2(PPh 3) 2] is paramagnetic and has a tetrahedral geometry. What is the hybridization of Ni ? sp 3 dsp 2 d 2sp 3 sp 3d 2 The splitting of d-orbitals in a square planar field follows the energy order: d x 2-y 2 > d xy > d z 2 > (d xz , d yz ) d z 2 > d x 2-y 2 > d xy > (d xz , d yz ) d xy > d x 2-y 2 > d z 2 > (d xz , d yz ) d x 2-y 2 > d z 2 > d xy > (d xz , d yz ) The crystal field stabilization energy (CFSE) for a d 3 ion in both octahedral and tetrahedral fields will be (in terms of Δ o and Δ t ): -1.2Δ o and -0.8Δ t -0.4Δ o and -0.6Δ t -1.2Δ o and -1.2Δ t -0.8Δ o and -0.4Δ t The hybridization of Nickel in the complex [Ni(CN) 4] 4- is: sp 3 dsp 2 d 2sp 3 sp 3d 2 The crystal field stabilization energy (CFSE) for a d 6 tetrahedral complex is: -0.6 t -0.4 t -1.2 t -2.4 t The Jahn-Teller effect is most significant in which of the following electronic configurations of an octahedral complex? High spin d 4 High spin d 5 Low spin d 6 d 3 For a d 4 metal ion, what condition must be met for it to form a high-spin octahedral complex? o < P o > P o = P o = 0 Which of the following electronic configurations for a d 6 ion in an octahedral field would result in zero CFSE? None of these High spin d 6 Low spin d 6 High spin d 5 The complex [Mn(CN) 6] 4- has a magnetic moment of 1.73 BM. The distribution of electrons in the d -orbitals of Mn is: t 2g 5 e g 0 t 2g 3 e g 2 t 2g 4 e g 1 t 2g 6 e g 0 According to Valence Bond Theory, the hybridization and shape of [Cu(NH 3) 4] 2+ are: dsp 2 , square planar sp 3 , tetrahedral sp 3d 2 , octahedral d 2sp 3 , octahedral Calculate the CFSE (excluding pairing energy) for a low-spin d 7 octahedral complex. -1.8 o -0.8 o -1.2 o -2.4 o According to crystal field theory, the correct order of ligands with respect to their decreasing order of field strength is CO > NH3 > H2O > Cl- CO > H2O > NH3 > Cl- Cl- > H2O > NH3 > CO Cl- > NH3 > H2O > CO Among the species given below, the spin-only magnetic moment is highest for (Given: Atomic number of Ti = 22, Mn = 25, Fe = 26 and Co = 27) [Mn(CN)6] 3- [Fe(CN)6] 3- [Co(NH3)6] 3+ [Ti(H2O)6] 3+ The correct increasing order of crystal field splitting ( o ) for the following ligands is: I - < F - < H 2O < CN - CN - < H 2O < F - < I - H 2O < F - < I - < CN - F - < I - < H 2O < CN - Which of the following complexes is colorless? [Sc(H 2O) 6] 3+ [Ti(H 2O) 6] 3+ [V(H 2O) 6] 3+ [Cr(H 2O) 6] 3+ The relationship between the crystal field splitting energy for tetrahedral ( Δ t ) and octahedral ( Δ o ) complexes is: Δ t = 4 9 Δ o Δ t = 9 4 Δ o Δ t = 1 2 Δ o Δ t = 2 Δ o The color of the coordination compounds is explained by the transition of electrons between d-orbitals. Which theory provided this explanation? Crystal Field Theory Valence Bond Theory Werner's Theory Molecular Orbital Theory In an octahedral crystal field, the d z 2 and d x 2-y 2 orbitals are called: e g orbitals t 2g orbitals Non-bonding orbitals A1g orbitals The spin-only magnetic moment of [Ti(H 2O) 6] 3+ is approximately: 1.73 BM 2.83 BM 3.87 BM 0 BM Which of the following ligands is 'stronger' than H 2O in the spectrochemical series? NH 3 F - Cl - OH - In an octahedral crystal field, the energy of the t 2g orbitals is relative to the average d-orbital energy. Lowered by 0.4 o Raised by 0.6 o Lowered by 0.6 o Raised by 0.4 o If a coordination compound absorbs light in the yellow region of the visible spectrum, what color will it appear to the eye? Violet Blue Green Orange In an octahedral complex, which of the following pairs of d-orbitals face the ligands directly? d x 2-y 2 and d z 2 d xy and d yz d xz and d xy d z 2 and d yz The spin-only magnetic moment of [V(H 2O) 6] 3+ is approximately: 2.83 BM 1.73 BM 3.87 BM 4.90 BM Which of the following ligands is a π-acceptor? CO F - OH - NH 3 [ Cr(H2O)6 ] Cl3 (at. No. of Cr = 24) has a magnetic moment of 3.83 B.M. The correct distribution of 3d electrons in the Chromium of the complex is:- (3d x 2-y 2) 1, 3d z 2 1, 3d xz 1 3d xy 1, (3d x 2-y 2) 1, 3d yz 1 3dxy 1, 3d yz 1, 3d xz 1 3d xy 1, 3d yz 1, 3dz 2 1 The electron distribution in d n coordination complexes depends on magnitude of crystal field splitting, ( o) and pairing energy (P) . The condition which favours formation of high spin complexes is t 2g 4 e g 0 o > P o < P o = P The hybridisation and magnetic behavior of the complex [Ni(CO) 4] are: sp 3 , diamagnetic dsp 2 , diamagnetic sp 3 , paramagnetic dsp 2 , paramagnetic The crystal field stabilization energy (CFSE) for high spin d 4 octahedral complex is: -0.6 Δ o -1.6 Δ o -1.2 Δ o -0.4 Δ o The violet color of the complex [Ti(H 2O) 6] 3+ is primarily attributed to: d-d transition Ligand to metal charge transfer Metal to ligand charge transfer Internal vibration of water molecules The geometry and magnetic moment of [NiCl 4] 2- are: Tetrahedral, 2.82 BM Square planar, 0 BM Tetrahedral, 0 BM Square planar, 2.82 BM What is the correct order of ligands in the spectrochemical series based on their field strength? I - < Br - < Cl - < F - < OH - < H 2O < NH 3 < en < CN - < CO CO < CN - < en < NH 3 < H 2O < OH - < F - < Cl - < Br - < I - I - < Cl - < Br - < F - < OH - < H 2O < en < NH 3 < CN - < CO I - < Br - < Cl - < F - < OH - < H 2O < en < NH 3 < CO < CN - Pick out the correct statement with respect to [Mn(CN) 6] 3- : It is d 2sp 3 hybridised and paramagnetic It is sp 3d 2 hybridised and paramagnetic It is d 2sp 3 hybridised and diamagnetic It is sp 3d 2 hybridised and diamagnetic Synergic bonding is observed in: Metal carbonyls Ammine complexes Aqua complexes Halide complexes Which of the following complexes is expected to be colored? [Ti(H 2O) 6] 3+ [Sc(H 2O) 6] 3+ [Cu(CN) 4] 3- [Zn(NH 3) 4] 2+ The spin-only magnetic moment of [CoF 6] 3- is (Atomic number of Co = 27 ): 4.90 BM 2.82 BM 5.92 BM 0 BM Among the following complexes, the one which shows the highest value of paramagnetic behavior is: [Fe(H 2O) 6] 3+ [Cr(H 2O) 6] 3+ [Zn(H 2O) 6] 2+ [Co(H 2O) 6] 2+ Identify the correct statement for [Fe(CN) 6] 4- and [Fe(CN) 6] 3- : Both are inner orbital complexes Both are outer orbital complexes Both are diamagnetic Both are paramagnetic The crystal field stabilization energy (CFSE) for a high spin d 5 octahedral complex is: 0.0 o -2.0 o -0.6 o -2.4 o + 2P Which of the following ligands is expected to be a -acid ligand? CO F - OH - NH 3 Which of the following electronic configurations is associated with the highest spin-only magnetic moment in an octahedral field? d 5 high spin d 5 low spin d 4 low spin d 6 low spin The geometry of [Ni(CN) 4] 2- and [NiCl 4] 2- are respectively: Square planar and Tetrahedral Tetrahedral and Square planar Both Square planar Both Tetrahedral In the complex [Fe(H 2O) 6]Cl 3 , the hybridization of Fe is: sp 3d 2 d 2sp 3 dsp 2 sp 3 If o < P (where P is pairing energy), the configuration of d 4 in an octahedral field is: t 2g 3 e g 1 t 2g 4 e g 0 t 2g 2 e g 2 t 2g 0 e g 4 Which of the following complexes is expected to absorb visible light of the lowest wavelength? [Co(CN) 6] 3- [Co(NH 3) 6] 3+ [Co(H 2O) 6] 3+ [CoF 6] 3- The crystal field stabilization energy (CFSE) for a low spin d 6 octahedral complex is: -2.4 Δ o + 3P -0.4 Δ o + P -1.2 Δ o + 3P -0.6 Δ o The spin-only magnetic moment of [Mn(CN) 6] 4- is: 1.73 BM 5.92 BM 4.89 BM 3.87 BM Which of the following is an inner orbital complex? [Co(NH 3) 6] 3+ [Ni(NH 3) 6] 2+ [FeF 6] 3- [CoF 6] 3- Which of the following is a π -acid ligand? CO NH 3 H 2O F - The complex [Co(NH 3) 6] 3+ is: Diamagnetic and inner orbital Paramagnetic and inner orbital Diamagnetic and outer orbital Paramagnetic and outer orbital Among the following complexes, which one will absorb light of the shortest wavelength? [Co(CN) 6] 3- [Co(NH 3) 6] 3+ [Co(H 2O) 6] 3+ [CoCl 6] 3- According to the spectrochemical series, which of the following ligands has the highest crystal field splitting energy ( o )? CN - en H 2O I - According to Crystal Field Theory, the energy of the d xy orbital in a tetrahedral field is: Raised by 0.4 t Lowered by 0.6 t Raised by 0.6 t Lowered by 0.4 t The intensive intense purple color of KMnO 4 is due to: Charge transfer from ligand to metal d-d transition Charge transfer from metal to ligand - transition In a synergic bond of metal carbonyls, the metal-carbon bond and the carbon-oxygen bond . strengthens, weakens weakens, strengthens strengthens, strengthens weakens, weakens Which of the following electronic configurations represents a 'low-spin' complex in an octahedral field? t 2g 4 e g 0 t 2g 3 e g 1 t 2g 3 e g 2 t 2g 4 e g 2 A complex [M(H 2O) 6]Cl 2 absorbs light in the red region. The color of the complex would be: Blue-green Yellow Violet Red Which of the following complexes is diamagnetic? [Ni(CN) 4] 2- [NiCl 4] 2- [CoF 6] 3- [Fe(H 2O) 6] 3+ In square planar complexes of Ni 2+ , which d-orbital has the highest energy? d x 2-y 2 d xy d z 2 d xz The correct order of o for the following complexes is: [Co(CN) 6] 3- > [Co(en) 3] 3+ > [Co(NH 3) 6] 3+ [Co(NH 3) 6] 3+ > [Co(en) 3] 3+ > [Co(CN) 6] 3- [Co(en) 3] 3+ > [Co(NH 3) 6] 3+ > [Co(CN) 6] 3- [Co(CN) 6] 3- > [Co(NH 3) 6] 3+ > [Co(en) 3] 3+ The spin-only magnetic moment of [Mn(H 2O) 6] 2+ is 5.92 BM. What is the electronic configuration of Mn in the t 2g and e g orbitals? t 2g 3 e g 2 t 2g 5 e g 0 t 2g 4 e g 1 t 2g 2 e g 3 Which of the following d-orbital orbitals is NOT involved in dsp 2 hybridization for square planar complexes? d z 2 d x 2-y 2 d xy d xz The complex [Ti(H 2O) 6] 3+ is colored because of: d-d transition Charge transfer spectra Presence of Cl - ions Large splitting energy Calculate the Crystal Field Stabilization Energy (CFSE) for a d 4 low-spin octahedral complex (ignore pairing energy). -1.6 o -0.6 o -2.0 o 0.0 o Which of the following complex ions is expected to show the highest value of o ? [Rh(NH 3) 6] 3+ [Co(NH 3) 6] 3+ [Ir(NH 3) 6] 3+ [Co(H 2O) 6] 3+ The reaction Ni 2+ + 2DMG [Ni(DMG) 2] produces a bright red precipitate. The hybridization and geometry of this complex are: dsp 2 , Square planar sp 3 , Tetrahedral d 2sp 3 , Octahedral sp 3d 2 , Octahedral Which of the following will exhibit maximum paramagnetic character? [Fe(H 2O) 6] 3+ [Fe(CN) 6] 3- [Fe(H 2O) 6] 2+ [Fe(CN) 6] 4- If the crystal field splitting energy for an octahedral complex ( Δ o ) is 18000 cm -1 , the crystal field splitting energy for a tetrahedral complex ( Δ t ) with the same metal and ligands will be: 8000 cm -1 16000 cm -1 20250 cm -1 9000 cm -1 In the metal carbonyls M(CO) n , the C-O stretching frequency is lowest when the metal is in which oxidation state? Negative oxidation state Zero oxidation state Positive oxidation state Higher positive oxidation state Which d-orbital is involved in the dsp 2 hybridization of a square planar complex? d x 2-y 2 d z 2 d xy d xz Compare the magnetic moments of K 4[Fe(CN) 6] and K 3[Fe(CN) 6] : K 4[Fe(CN) 6] is diamagnetic and K 3[Fe(CN) 6] is paramagnetic Both are diamagnetic Both are paramagnetic K 4[Fe(CN) 6] is paramagnetic and K 3[Fe(CN) 6] is diamagnetic The magnetic moment of [Ni(H 2O) 6] 2+ is approximately: 2.83 BM 1.73 BM 3.87 BM 0 BM The crystal field stabilization energy (CFSE) for a d 9 octahedral complex is: -0.6 o -1.2 o -0.4 o -1.8 o The correct electronic configuration for a d 4 ion in a strong octahedral field is: t 2g 4 e g 0 t 2g 3 e g 1 t 2g 2 e g 2 e g 4 t 2g 0 The electronic configuration of a d 4 metal ion in a tetrahedral field is: e 2 t 2 2 t 2g 3 e g 1 e 3 t 2 1 t 2 4 e 0 The geometry of the complex ion [CuCl 4] 2- is: Distorted tetrahedral Square planar Perfectly tetrahedral Octahedral Which of the following statements is true for the complex [Co(ox) 3] 3- ? It is diamagnetic and low spin. It is paramagnetic and high spin. It is paramagnetic and low spin. It is diamagnetic and high spin. In the spectrochemical series, which of the following represents the correct increasing order of field strength? I - < Br - < SCN - < Cl - Cl - < SCN - < Br - < I - SCN - < I - < Br - < Cl - I - < Cl - < Br - < SCN - When ethylenediamine ( en ) is added to an aqueous solution of [Ni(H 2O) 6] 2+ , the color changes from green to blue. This is because: en is a stronger ligand than H 2O , increasing o . en is a weaker ligand than H 2O , decreasing o . Nickel is oxidized to Ni 3+ . The geometry changes from octahedral to tetrahedral. The complex [Mn(CN) 6] 3- is and has unpaired electrons. Paramagnetic, 2 Diamagnetic, 0 Paramagnetic, 4 Paramagnetic, 5 Which of the following d n systems can exhibit both high-spin and low-spin states in an octahedral field depending on the ligand strength? d 7 d 3 d 9 d 10 The hybridization of the central metal in a tetrahedral complex involves which d-orbitals according to CFT (if any)? None, it typically uses s and p orbitals in VBT ( sp 3 ) d x 2-y 2 and d z 2 d xy , d yz , and d zx d z 2 only Which of the following d-block elements forms a square planar complex in the +2 oxidation state with strong field ligands despite being a 4d element? Pd 2+ Zn 2+ Fe 2+ Cu 2+ The correct order of increasing field strength of ligands is: I - < Cl - < F - < OH - OH - < F - < Cl - < I - Cl - < I - < OH - < F - F - < OH - < I - < Cl - The spin-only magnetic moment of Cr 2+ ion is approximately: 4.90 BM 3.87 BM 5.92 BM 2.83 BM In a d 8 octahedral complex, the number of unpaired electrons is: 2 0 4 3 Among the following, which one is a 'high-spin' complex? [CoF 6] 3- [Co(CN) 6] 3- [Co(en) 3] 3+ [Co(NH 3) 6] 3+ Which d-orbital is most destabilized (highest energy) in an octahedral crystal field? d x 2-y 2 and d z 2 d xy d yz d zx The shape of the [PtCl 4] 2- ion is: Square planar Tetrahedral Octahedral Trigonal bipyramidal Which of the following complexes is expected to be paramagnetic? [Fe(H 2O) 6] 2+ [Ni(CN) 4] 2- [Co(NH 3) 6] 3+ [Zn(NH 3) 4] 2+ For an octahedral complex with d 5 configuration, what is the spin-only magnetic moment in a strong ligand field? 1.73 BM 5.92 BM 3.87 BM 0 BM Which of the following is correct regarding the t 2g and e g orbitals in a tetrahedral field? The e orbitals are lower in energy than the t 2 orbitals. The t 2g orbitals are lower in energy than the e g orbitals. There are 3 orbitals in the e set. The splitting energy t is larger than o . What is the Crystal Field Stabilization Energy (CFSE) for a d 8 octahedral complex? -1.2 o -0.8 o -1.6 o -2.4 o In metal carbonyls, the synergic bonding involves the overlap of: Filled d-orbitals of metal with empty anti-bonding orbitals of CO Empty d-orbitals of metal with filled orbitals of CO Filled s-orbitals of metal with empty orbitals of CO Filled p-orbitals of metal with empty d-orbitals of CO The hybridization and magnetic nature of the complex [FeF 6] 3- are: sp 3d 2 , paramagnetic d 2sp 3 , paramagnetic sp 3d 2 , diamagnetic d 2sp 3 , diamagnetic Calculate the CFSE for a d 3 ion in an octahedral field. -1.2 o -0.4 o -0.6 o -0.8 o The hybridization of Platinum in the complex ion [PtCl 4] 2- is: dsp 2 sp 3 sp 3d 2 d 2sp 3 Which of the following is an inner orbital octahedral complex? [Co(NH 3) 6] 3+ [CoF 6] 3- [Ni(NH 3) 6] 2+ [Fe(H 2O) 6] 3+ The spin-only magnetic moment for a high-spin d 6 octahedral complex is: 4.90 BM 5.92 BM 2.83 BM 1.73 BM In an octahedral field, if the crystal field splitting energy ( o ) is greater than the pairing energy ( P ), the fourth electron enters: A t 2g orbital to cause pairing An e g orbital A 4s orbital The d z 2 orbital only What is the spin-only magnetic moment of the complex ion [Cr(H 2O) 6] 3+ ? 3.87 BM 4.90 BM 1.73 BM 2.83 BM Which one of the following is an inner orbital complex as well as diamagnetic in behaviour - [Zn(NH3)6] 2+ [Ni(NH3)6] 2+ [Cr(NH3)6] 3+ [Co(NH3)6] 3+ The d electron configurations of Cr 2+ , Mn 2+ , Fe 2+ and Ni 2+ are 3d 4 , 3d 5 , 3d 6 and 3d 8 respectively. Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour? (At. No. Cr = 24, Mn =25, Fe =26, Ni =28) [Fe(H 2 O) 6 ] 2+ [Ni(H 2 O) 6 ] 2+ [Cr(H 2 O) 6 ] 2+ [Mn(H 2 O) 6 ] 2+ Which of the following complex ions is expected to absorb visible light ? (At no. Zn = 30, Sc = 21, Ti = 22, Cr = 24) [ Zn(NH 3) 6 ] 2+ [ Sc(H 2O) 3(NH 3) 3 ] 3+ [ Ti(en) 2(NH 3) 2 ] 4+ [ Cr(NH 3) 6 ] 3+ Out of TiF 6 2- and CoF 6 3- , Cu 2Cl 2 and NiCl 4 2- (Z of Ti = 22, Co = 27, Cu = 29, Ni = 28) the colourless species are : - CoF 6 3- and NiCl 4 2- TiF 6 2- and CoF 6 3- Cu 2Cl 2 and NiCl 4 2- TiF 6 2- and Cu 2Cl 2 A magnetic moment of 1.73 BM will be shown by one among the following [Cu(NH3)4] 2+ [Ni(CN)4] 2- TiCl4 [CoCl6] 4-