Coordination Compounds

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Which of the following are paramagnetic?A. [NiCl_4]^2- B. Ni(CO)_4 C. [Ni(CN)_4]^2- D. [Ni(H_2O)_6]^2+ E. Ni(PPh_3)_4Choose the correct answer from the options given below: Answer: 3. A and D only Key idea: paramagnetic means unpaired electrons. A: mathrm[NiCl₄]²⁻ , mathrmNi²⁺ d⁸, weak field Cl⁻, tetrahedral sp³... Crystal field theory, colour and magnetic properties 1 answer
The correct order of the wavelength of light absorbed by the following complexes is,A. [Co(NH_3)_6]^3+ B. [Co(CN)_6]^3- C. [Cu(H_2O)_4]^2+ D. [Ti(H_2O)_6]^3+Choose the correct answer from the options given below: Answer: 2. B < A < D < C Key idea: the larger the crystal field splitting Δ , the higher the energy absorbed and the shorter the wavelength.... Crystal field theory, colour and magnetic properties 1 answer
Out of the following complex compounds, which of the compound will be having the minimum conductance in solution? Answer: 1. [Co(NH₃)₃Cl₃] or 2. [Co(NH₃)₄Cl₂] Key idea: conductance in solution depends on the number of ions produced; a non-electrolyte giv... Werner's theory, ligands, coordination number, denticity, chelation 1 answer
Given below are two statements :Statement I : [Co(NH_3)_6]^3+ is a homoleptic complex whereas [Co(NH_3)_4Cl_2]^+ is a heteroleptic complex.Statement II : Complex [Co(NH_3)_6]^3+ has only one kind of ligands but [Co(NH_3)_4Cl_2]^+ has more than one ki… Answer: 2. Both Statement I and Statement II are true. Key idea: a homoleptic complex has only one kind of ligand; a heteroleptic complex ha... Werner's theory, ligands, coordination number, denticity, chelation 1 answer
Match List I with List II.List I (Complex): A. [Co(NH_3)_5(NO_2)]Cl_2 B. [Co(NH_3)_5(SO_4)]Br C. [Co(NH_3)_6][Cr(CN)_6] D. [Co(H_2O)_6]Cl_3List II (Type of isomerism): I. Solvate isomerism II. Linkage isomerism III. Ionization isomerism IV. Coordinat… Answer: 2. A-II, B-III, C-IV, D-I Key idea: match each complex to the isomerism it can show. A, [Co(NH₃)₅(NO₂)]Cl₂ : NO₂^- is ambidentate, s... Isomerism in coordination compounds 1 answer
Given below are two statements :Statement I : Both [Co(NH_3)_6]^3+ and [CoF_6]^3- complexes are octahedral but differ in their magnetic behaviour.Statement II : [Co(NH_3)_6]^3+ is diamagnetic whereas [CoF_6]^3- is paramagnetic.In the light of the abo… Answer: 2. Both Statement I and Statement II are true. Key idea: the ligand field strength decides pairing in mathrmCo³⁺ ( d⁶ ). NH₃ is a st... Valence bond approach 1 answer
Which complex compound is most stable? Answer: 4. [CoCl₂(en)₂]NO₃ Key idea: A chelating ligand makes a complex more stable (chelate effect). In [CoCl₂(en)₂]NO₃ , the ligand en (et... Werner's theory, ligands, coordination number, denticity, chelation 1 answer
Homoleptic complex from the following complexes is : Answer: 2. Potassium trioxalatoaluminate (III) Key idea: A homoleptic complex has only one kind of ligand bonded to the metal. Potassium tri... Werner's theory, ligands, coordination number, denticity, chelation 1 answer
The order of energy absorbed which is responsible for the color of complexes(A) [Ni(H_2O)_2(en)_2]^2+(B) [Ni(H_2O)_4(en)]^2+ and(C) [Ni(en)_3]^2+is Answer: 4. (C) > (A) > (B) Key idea: stronger field ligands cause larger splitting Δ_o , so the complex absorbs higher energy light. Ligand... Crystal field theory, colour and magnetic properties 1 answer
The IUPAC name of the complex -[Ag(H_2O)_2][Ag(CN)_2] is : Answer: 1. diaquasilver(I) dicyanidoargentate(I) Key idea: in a complex salt name the cation first and then the anion; in anionic complexes... IUPAC nomenclature 1 answer
Match List - I with List - II.List - I : (a) [Fe(CN)_6]^3- (b) [Fe(H_2O)_6]^3+ (c) [Fe(CN)_6]^4- (d) [Fe(H_2O)_6]^2+List - II : (i) 5.92 BM (ii) 0 BM (iii) 4.90 BM (iv) 1.73 BMChoose the correct answer from the options given below. Answer: 4. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii) Key idea: find unpaired electrons n and use μ=√(n(n+2)) BM. (a) mathrm[Fe(CN)₆]³⁻ : mathrm... Crystal field theory, colour and magnetic properties 1 answer
Ethylene diaminetetraacetate (EDTA) ion is : Answer: 1. Hexadentate ligand with four "O" and two "N" donor atoms Key idea: EDTA ⁴⁻ is a hexadentate ligand. It has two nitrogen donor ato... Werner's theory, ligands, coordination number, denticity, chelation 1 answer
Which of the following is the correct order of increasing field strength of ligands to form coordination compounds ? Answer: 1. SCN ^- < F ^- < C ₂ O ₄²⁻ < CN ^- From the spectrochemical series (weak to strong field): mathrmI^- So the increasing order is ma... Crystal field theory, colour and magnetic properties 1 answer
Urea reacts with water to form A which will decompose to form B. B when passed through Cu^2+ (aq), deep blue colour solution C is formed. What is the formula of C from the following ? Answer: 2. [Cu(NH ₃ ) ₄ ] ²⁺ Urea + water: NH₂CONH₂+2H₂O→(NH₄)₂CO₃ (A). On decomposition: (NH₄)₂CO₃→ 2NH₃+CO₂+H₂O ; B is NH₃ . NH₃ with math... Werner's theory, ligands, coordination number, denticity, chelation 1 answer
What is the correct electronic configuration of the central atom in K_4[Fe(CN)_6] based on crystal field theory ? Answer: 2. t_2g⁶e_g⁰ In K₄[Fe(CN)₆] iron is Fe(II), a d⁶ ion. CN^- is a strong field ligand, so the pairing energy is lower than Δ_o and all... Crystal field theory, colour and magnetic properties 1 answer
Which one of the following ions exhibits d-d transition and paramagnetism as well ? Answer: 4. MnO ₄²⁻ d-d transitions need partly filled d orbitals; paramagnetism needs unpaired electrons. mathrmCrO₄²⁻ : Cr(+6), d⁰ . MnO₄^-... Crystal field theory, colour and magnetic properties 1 answer
Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code :Column I: a. Co^3+; b. Cr^3+; c. Fe^3+; d. Ni^2+Column II: i. √(8) B.M.; ii. √(35) B.M.; iii. √(3) B.M.; iv. √(24) B.M.;… Answer: 1. a-iv, b-v, c-ii, d-i Use μ=√(n(n+2)) with n unpaired electrons. mathrmCo³⁺ ( d⁶ , high spin, n = 4): √(24) (iv). mathrmCr³⁺ ( d³... Crystal field theory, colour and magnetic properties 1 answer
The type of isomerism shown by the complex [CoCl_2(en)_2] is Answer: 1. Geometrical isomerism [CoCl₂(en)₂] is octahedral of type [M(AA)₂X₂] . The two Cl can be adjacent (cis) or opposite (trans), so it... Isomerism in coordination compounds 1 answer
The geometry and magnetic behaviour of the complex [Ni(CO)_4] are Answer: 3. tetrahedral geometry and diamagnetic In [Ni(CO)₄] Ni is in the zero oxidation state with configuration 3d⁸ 4s² . CO is a strong-f... Valence bond approach 1 answer
Iron carbonyl, Fe(CO)_5 is Answer: 3. mononuclear Fe(CO)₅ contains one metal atom, so it is mononuclear. Dinuclear and polynuclear carbonyls like mathrmMn₂(CO)₁₀ and m... Werner's theory, ligands, coordination number, denticity, chelation 1 answer
Correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co^3+ is : Answer: 4. [Co(en)₃]³⁺, [Co(NH₃)₆]³⁺, [Co(H₂O)₆]³⁺ Key idea: stronger ligand field means a larger splitting Δ_o , which means light of highe... Crystal field theory, colour and magnetic properties 1 answer
The correct order of the stoichiometries of AgCl formed when AgNO_3 in excess is treated with the complexes : CoCl_3.6NH_3, CoCl_3.5NH_3, CoCl_3.4NH_3 respectively is : Answer: 2. 3 AgCl, 2 AgCl, 1 AgCl Key idea: only ionisable (outside the coordination sphere) chloride precipitates with AgNO₃ . CoCl₃·6NH₃ =... Werner's theory, ligands, coordination number, denticity, chelation 1 answer
Pick out the correct statement with respect to [Mn(CN)_6]^3- : Answer: 2. It is d²sp³ hybridised and octahedral Key idea: cyanide is a strong-field ligand, which pairs the d electrons. In [Mn(CN)₆]³⁻ , M... Valence bond approach 1 answer
An example of a sigma bonded organometallic compound is : Answer: 1. Grignard's reagent Key idea: in a sigma-bonded organometallic compound, a metal-carbon sigma bond is present. Grignard's reagent,... Werner's theory, ligands, coordination number, denticity, chelation 1 answer

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