JEE Main
Chemistry
Coordination Compounds
Previous Years Questions

The complex cation which has two isomers is :
Which of the following complex will show largest splitting of d-orbitals?
Which of the following are the example of double salt? A. $$\mathrm{FeSO}_{4} \cdot\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} \cdot 6 \mathrm{H}... A solution of$$\mathrm{FeCl_3}$$when treated with$$\mathrm{K_4[Fe(CN)_6]}$$gives a prussium blue precipitate due to the formation of Cobalt chloride when dissolved in water forms pink colored complex$$\underline{\mathrm{X}}$$which has octahedral geometry. This solution on treating... Formulae for Nessler's reagent is: Match List I with List II: .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-famil... The \mathrm{Cl}-\mathrm{Co}-\mathrm{Cl} bond angle values in a fac- \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{3} \mathrm{Cl}_{3}\right] compl... To inhibit the growth of tumours, identify the compounds used from the following : A. EDTA B. Coordination Compounds of Pt C. D - Penicillamine D. Cis... Which of the following is correct order of ligand field strength? Correct order of spin only magnetic moment of the following complex ions is : (Given At.no. Fe: 26, Co: 27) Chiral complex from the following is : Here en = ethylene diamine Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family... A chloride salt solution acidified with dil.HNO$$_3$$gives a curdy white precipitate, [A], on addition of AgNO$$_3$$. [A] on treatment with NH$$_4$$O... The hybridization and magnetic behaviour of cobalt ion in$$\mathrm{[Co(NH_3)_6]^{3+}}$$complex, respectively is Which of the following cannot be explained by crystal field theory? The primary and secondary valencies of cobalt respectively in$$\mathrm{[Co(NH_3)_5Cl]Cl_2}$$are : Octahedral complexes of copper(II) undergo structural distortion (Jahn-Teller). Which one of the given copper (II) complexes will show the maximum str... Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family... Low oxidation state of metals in their complexes are common when ligands:$$\mathrm{Fe}^{3+}$$cation gives a prussian blue precipitate on addition of potassium ferrocyanide solution due to the formation of : The metal complex that is diamagnetic is (Atomic number:$$\mathrm{Fe}, 26 ; \mathrm{Cu}, 29)$$The correct order of energy of absorption for the following metal complexes is A : [Ni(en)3]2+ , B : [Ni(NH3)6]2+ , C : [Ni(H2O)6]2+... Correct formula of the compound which gives a white precipitate with BaCl2 solution, but not with AgNO3 solution, is Given below are two statements.$$\bullet$$Statement I : In CuSO4 . 5H2O, Cu-O bonds are present.$$\bullet$$Statement II : In CuSO4 . 5H2O, ligands... Given below are two statements : Statement I : [Ni(CN)4]2$$-$$is square planar and diamagnetic complex, with dsp2 hybridization for Ni but [Ni(CO)4] ... The formula of the purple colour formed in Laissaigne's test for sulphur using sodium nitroprusside is Arrange the following coordination compounds in the increasing order of magnetic moments. (Atomic numbers : Mn = 25; Fe = 26) A. [FeF6]3$$-$$B. [Fe(C... Which of the following will have maximum stabilization due to crystal field? Which statement is not true with respect to nitrate ion test? Transition metal complex with highest value of crystal field splitting ($$\Delta$$0) will be Match List - I with List - II : .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-... The Crystal Field Stabilization Energy (CFSE) and magnetic moment (spin-only) of an octahedral aqua complex of a metal ion (Mz+) are$$-$$0.8$$\Delta...
The potassium ferrocyanide solution gives a Prussian blue colour, when added to :
Spin only magnetic moment in BM of [Fe(CO)4(C2O4)]+ is :
The denticity of an organic ligand, biuret is :
The addition of dilute NaOH to Cr3+ salt solution will give :
Indicate the complex/complex ion which did not show any geometrical isomerism :
Arrange the following Cobalt complexes in the order of increasing Crystal Field Stabilization Energy (CFSE) value.Complexes : $$\mathop {{{[Co{F_6}]}^... Which one of the following complexes is violet in colour? Given below are two statements :Statement I :$${[Mn{(CN)_6}]^{3 - }}$$,$${[Fe{(CN)_6}]^{3 - }}$$and$${[Co{({C_2}{O_4})_3}]^{3 - }}$$are d2sp3 hyb... The type of hybridisation and magnetic property of the complex [MnCl6]3$$-$$, respectively, are : The number of geometrical isomers found in the metal complexes [PtCl2(NH3)2], [Ni(CO)4], [Ru(H2O)3Cl3 and [CoCl2(NH3)4]+ respectively, are :... Which one of the following metal complexes is most stable? Which one of the following species responds to an external magnetic field? Which one of the following compounds of Group-14 elements is not known? Spin only magnetic moment of an octahedral complex of Fe2+ in the presence of a strong field ligand in BM is : Which one of the following species doesn't have a magnetic moment of 1.73 BM, (spin only value)? According to the valence bond theory the hybridization of central metal atom is dsp2 for which one of the following compounds? The correct order of intensity of colors of the compounds is : The correct structures of trans-[NiBr2(PPh3)2] and meridonial-[Co(NH3)3(NO2)3], respectively, are... Match List - I with List - II : List - I List - II (a)$$[Co{(N{H_3})_6}][Cr{(CN)_6}]$$(i) Linkage isom... Arrange the following metal complex/compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system.(Atomic nu... In which of the following order the given complex ions are arranged correctly with respect to their decreasing spin only magnetic moment?(i) [FeF6]3$$...
The hybridization and magnetic nature of $${[Mn{(CN)_6}]^{4 - }}$$ and $${[Fe{(CN)_6}]^{3 - }}$$, respectively are :
The calculated magnetic moments (spin only value) for species $${[FeC{l_4}]^{2 - }}$$, $${[Co{({C_2}{O_4})_3}]^{3 - }}$$ and $$MnO_4^{2 - }$$ respecti...
For a d4 metal ion in an octahedral field, the correct electronic configuration is :
The species that has a spin-only magnetic moment of 5.9 BM, is : (Td = tetrahedral)
Consider the complex ions, trans-[Co(en)2Cl2]+ (A) and cis-[Co(en)2Cl2]+ (B). The correct statement regarding them is :...
The values of the crystal field stabilization energies for a high spin d6 metal ion in octahedral and tetrahedral fields, respectively, are :...
The Crystal Field Stabilization Energy (CFSE) of [CoF3(H2O)3] ($$\Delta$$0 < P) is :
The one that can exhibit highest paramagnetic behaviour among the following is : gly = glycinato; bpy = 2, 2'-bipyridine
The molecule in which hybrid MOs involve only one d-orbital of the central atom is :
The number of isomers possible for [Pt(en)(NO2)2] is :
The pair in which both the species have the same magnetic moment (spin only) is :
The d-electron configuration of [Ru(en)3 ]Cl2 and [Fe(H2O)6]Cl2 , respectively are :
Complex A has a composition of H12O6Cl3Cr. If the complex on treatment with conc.H2SO4 loses 13.5% of its original mass, the correct molecular formul...
The complex that can show optical activity is :
The electronic spectrum of [Ti(H2O)6]3+ shows a single broad peak with a maximum at 20,300 cm-1 . The crystal field stabilization energy (CFSE) of the...
Simplified absorption spectra of three complexes ((i), (ii) and (iii)) of Mn+ ion are provided below; their $$\lambda$$max values are marked as A, B ...
The one that is not expected to show isomerism is :
For octahedral Mn(II) and tetrahedral Ni(II) complexes, consider the following statements: (I) both the complexes can be high spin. (II) Ni(II) comple...
Consider that a d6 metal ion (M2+) forms a complex with aqua ligands, and the spin only magnetic moment of the complex is 4.90 BM. The geometry and th...
The correct order of the spin-only magnetic moments of the following complexes is : (I) [Cr(H2O)6]Br2 (II) Na4[Fe(CN)6] (III) Na3[Fe(C2O4)3] ($$\Delta... The isomer(s) of [Co(NH3)4Cl2] that has/have a Cl–Co–Cl angle of 90°, is/are : [Pd(F)(Cl)(Br)(I)]2– has n number of geometrical isomers. Then, the spin-only magnetic moment and crystal field stabilisation energy [CFSE] of [Fe(CN)... Complex X of composition Cr(H2O)6Cln has a spin only magnetic moment of 3.83 BM. It reacts with AgNO3 and shows geometrical isomerism. The IUPAC nomen... Among (a) – (d) the complexes that can display geometrical isomerism are : (a) [Pt(NH3)3Cl]+ (b) [Pt(NH3)Cl5]– (c) [Pt(NH3)2Cl(NO2)] (d) [Pt(NH3)4Cl... The correct order of the calculated spin-only magnetic moments of complexs (A) to (D) is: (A) Ni(CO)4 (B) [Ni(H2O)6]Cl2 (C) Na2[Ni(CN)4] (D) PdCl2(PPh... The complex that can show fac- and mer-isomers is : The number of possible optical isomers for the complexes MA2B2 with sp3 and dsp2 hydridized metal atom. respectively, is : Note : A and B are unidenta... Among the statements(a)-(d) the incorrect ones are : (a) Octahedral CO(III) complexes with strong fields ligands have very high magnetic moments. (b) ... The theory that can completely/properly explain the nature of bonding in [Ni(Co)4] is : The IUPAC name of complex [Pt(NH3)2Cl(NH2CH3)]Cl is: The coordination numbers of Co and Al in [Co(Cl)(en)2]Cl and K3[Al(C2O4)3], respectively, are : (en = ethane-1, 2-diamine) ... The compound used in the treatment of lead poisoning is : The complex ion that will lose its crystal field stabilization energy upon oxidation of its metal to +3 state is : ... Complete removal of both the axial ligands (along the z-axis) from an octahedral complex leads to which of the following splitting patterns? (relative... The INCORRECT statement is : The crystal field stabilization energy (CFSE) of [Fe(H2O)6]Cl2 and K2[NiCl4] respectively, are : ... The species that can have a trans-isomer is : (en = ehane-1, 2-diamine, ox = oxalate) Three complexes, [CoCl(NH3)5] 2+(I), [Co(NH3)5H2O]3+ (II) and [Co(NH3)6] 3+(III) absorb light in the visible region. The correct order of the waveleng... The maximum possible denticities of a ligand given below towards a common transition and inner-transition metal ion, respectively, are : ... The degenerate orbitals of [Cr(H2O)6]3+ are : The one that will show optical activity is : (en = ethane-1,2-diamine) The compound that inhibits the growth of tumors is : The calculated spin-only magnetic moments (BM) of the anionic and cationic species of [Fe(H2O)6]2 and [Fe(CN)6], respectively, are :... The following ligand is : ... The correct order of the spin-only magnetic moment of metal ions in the following low-spin complexes, [V(CN)6]4–,[Fe(CN)6]4–, [Ru(NH3)6]3+, and [Cr(NH... The magnetic moment of an octahedral homoleptic Mn(II) complex is 5.9 BM. The suitable ligand for this complex is - The pair of metal ions that can give a spin only magnetic moment of 3.9 BM for the complex [M(H2O)6]Cl2, is - The metal d-orbitals that are directly facing the ligands in K3[Co(CN)6] are - Mn2(CO)10 is an organometallic compound due to the presence of - The number of bridging CO ligand(s) and Co-Co bond(s) in Co2(CO)8, respectively are : The coordination number of Th in K4[Th(C2O4)4(OH2)2] is : (C2O$${_4^{2 - }}$$= Oxalato)... Match the metals (column I) with the coordination compound(s)/enzyme(s) (column II) .tg {border-collapse:collapse;border-spacing:0;width:100%} .tg ... A reaction of cobalt (III) chloride and ethylenediamine in a 1 : 2 mole ratio generates two isomeric products A (violet coloured) and B (green coloure... The difference in the number of unpaired electrons of a metal ion in its high spin and low-spin octahedral complexes is two. The metal ion is - Which of the following is not an example of heterogenous catalytic reaction ? The total number of isomers for a square planar complex [M(F)(Cl)(SCN)(NO2)] is The complex that has highest crystal field splitting energy ($$\Delta $$), is : Homoleptic octahedral complexes of a metal ion 'M3+' with three monodenate ligands L1, L2 and L3 adsorb wavelenths in the region of green, blue and re... Two complexes [Cr(H2O)6]Cl3 (A) and [Cr(NH3)6]Cl3 (B) are violet and yellow coloured, respectively. The incorrect statement regarding them i... In Wilkinson's catalyst, the hybridization of central metal ion and its shape are respectively : Which of the following complexes will shows geometrical isomerism ? The oxidation states of Cr in [Cr(H2O)6]Cl3, [Cr(C6H6)2] and K2[Cr(CN)2(O)2(O2)(NH3)] respectively are ... Consider the following reaction and statements: [Co(NH3)4Br2]+ + Br-$$\to$$[Co(NH3)3Br3] + NH3 (I) Two isomers are produced if the reactant complex ... The correct order of spin-only magnetic moments among the following is : (Atomic number : Mn = 25, Co = 27, Ni = 28, Zn = 30) The total number of possible isomers for square-planar [Pt(Cl)(NO2)(NO3)(SCN)]2- is : The correct combination is : [Co2(CO)8] displays : The pair of compounds having metals in their highest oxidation state is : On treatment of 100 mL of 0.1 M solution of CoCl3. 6H2O with excess AgNO3; 1.2$$\times$$1022 ions are precipitated. The complex is:... Which of the following is an example of homoleptic complex ? Identify the correct trend given below : (Atomic No.=Ti : 22, Cr : 24 and Mo : 42) Which one of the following complexes will consume more equivalents of aqueous solution of Ag(NO3) ? Which one of the following complexes shows optical isomerism? (en = ethylenediamine) The pair having the same magnetic moment is : [At. No.: Cr = 24, Mn = 25, Fe = 26, Co = 27] Which of the following compounds is not colored yellow? The color of KMnO4 is due to: The number of geometric isomers that can exist for square planar [Pt (Cl) (py) (NH3) (NH2OH)]+ is (py = pyridine): The octahedral complex of a metal ion M3+ with four monodentate ligands L1, L2, L3 and L4 absorb wavelengths in the region of red, green, yellow and b... The equation which is balanced and represents the correct product(s) is: Which of the following complex species is not expected to exhibit optical isomerism? Which among the following will be named as dibromidobis (ethylene diamine) chromium(III) bromide ? Which of the following facts about the complex [Cr (NH3)6 ]Cl3 is wrong? The magnetic moment (spin only) of [NiCl4]2− is Which one of the following has an optical isomer ? (en = ethylenediamine) A solution containing 2.675g of CoCl3. 6NH3 (molar mass = 267.5 g mol–1) is passed through a cation exchanger. The chloride ions obtained in solution ... Which of the following pairs represents linkage isomers ? Which of the following has an optical isomer ? In which of the following octahedral complexes of Co (at. no. 27), will the magnitude of$$\Delta _o$$be the highest? The coordination number and the oxidation state of the element ‘E’ in the complex [E(en)2(C2O4)]NO2 (where (en) is ethylene diamine) are, respectively... Which one of the following has a square planar geometry? The “spin-only” magnetic moment [in units of Bohr magneton, (µB)] of Ni2+ in aqueous solution would be (Atomic number of Ni = 28) ... Nickel (Z = 28) combines with a uninegative monodentate ligand X– to form a paramagnetic complex [NiX4]2− . The number of unpaired electron(s) in the ... The IUPAC name for the complex [Co(NO2)(NH3)5]Cl2 is In Fe(CO)5, the Fe – C bond possesses How many EDTA (ethylenediaminetetraacetic acid) molecules are required to make an octahedral complex with a Ca2+ ion? The IUPAC name of the coordination compound K3[Fe(CN)6] is The oxidation state of Cr in [Cr(NH3)4Cl2]+ is Which of the following compounds shows optical isomerism? The value of the ‘spin only’ magnetic moment for one of the following configurations is 2.84 BM. The correct one is Which one of the following cyano complexes would exhibit the lowest value of paramagnetic behaviour? (At. No. Cr = 24, Mn = 25, Fe = 26, Co = 27) ... Which one of the following complexes in an outer orbital complex? Coordination compound have great importance in biological systems. In this context which of the following statements is incorrect? Which one the following has largest number of isomers? (R = alkyl group, en = ethylenediamine) The coordination number of central metal atom in a complex is determined by The correct order of magnetic moments (spin only values in B.M.) among is (Atomic numbers: Mn = 25; Fe = 26, Co =27) Among the properties (a) reducing (b) oxidising (c) complexing, the set of properties shown by CN– ion towards metal species is : Ammonia forms the complex ion [Cu(NH3)4]2+ with copper ions in alkaline solutions but not in acidic solutions. What is the reason for it? ... One mole of the complex compound Co(NH3)5Cl3, gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with two moles of AgN... In the coordination compound, K4[Ni(CN)4], the oxidation state of nickel is The most stable ion is CH3 - Mg - Br is an organometallic compound due to ## Numerical The spin only magnetic moment of$$\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$$complexes is _________ B.M. (Nearest inte... If the CFSE of \left[\mathrm{Ti}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+} is -96.0 \mathrm{~kJ} / \mathrm{mol}, this complex will abs... The sum of bridging carbonyls in$$\mathrm{W(CO)_6}$$and$$\mathrm{Mn_2(CO)_{10}}$$is ____________. Total number of moles of AgCl precipitated on addition of excess of AgNO$$_3$$to one mole each of the following complexes$$\mathrm{[Co(NH_3)_4Cl_2]C...
The number of paramagnetic species from the following is _____________. $$\mathrm{{[Ni{(CN)_4}]^{2 - }},[Ni{(CO)_4}],{[NiC{l_4}]^{2 - }}}$$ $$\mathrm{... The d-electronic configuration of$$\mathrm{[CoCl_4]^{2-}}$$in tetrahedral crystal field in$${e^mt_2^n}$$. Sum of "m" and "number of unpaired electr... Sum of oxidation state (magnitude) and coordination number of cobalt in$$\mathrm{Na}\left[\mathrm{Co}(\mathrm{bpy}) \mathrm{Cl}_{4}\right]$$is _____...$$\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$$should be an inner orbital complex. Ignoring the pairing energy, the value of crystal field stabili... Total number of relatively more stable isomer(s) possible for octahedral complex$$\left[\mathrm{Cu}(\mathrm{en})_{2}(\mathrm{SCN})_{2}\right]$$will ... The conductivity of a solution of complex with formula$$\mathrm{CoCl}_{3}\left(\mathrm{NH}_{3}\right)_{4}$$corresponds to 1:1 electrolyte, then the ... The difference between spin only magnetic moment values of$$\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]\mathrm{Cl}_{2}$$and ... Consider the following metal complexes :$$\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\...
In the following brown complex, the oxidation state of iron is +_____________. $${[Fe{({H_2}O)_6}]^{2 + }} + NO \to \mathop {{{[Fe{{({H_2}O)}_5}(NO)]}... Spin only magnetic moment ($$\mu$$s) of$${K_3}[Fe{(CN)_6}]$$is ____________ B.M. (Nearest integer) Spin only magnetic moment of [MnBr6]4$$-$$is _________ B.M. (round off to the closest integer)$${[Fe{(CN)_6}]^{4 - }}{[Fe{(CN)_6}]^{3 - }}{[Ti{(CN)_6}]^{3 - }}{[Ni{(CN)_4}]^{2 - }}{[Co{(CN)_6}]^{3 - }}$$Among the given comp... (a) CoCl3.4NH3, (b) CoCl3.5NH3, (c) CoCl3.6NH3 and (d) CoCl(NO3)2.... Number of complexes which will exhibit synergic bonding amongst,$$[Cr{(CO)_6}]$$,$$[Mn{(CO)_5}]$$and$$[M{n_2}{(CO)_{10}}]$$is ___________. Acidified potassium permanganate solution oxidises oxalic acid. The spin-only magnetic moment of the manganese product formed from the above reaction ... Reaction of [Co(H2O)6]2+ with excess ammonia and in the presence of oxygen results into a diamagnetic product. Number of electrons present in t2g-orbi... The spin-only magnetic moment value of an octahedral complex among CoCl3.4NH3, NiCl2.6H2O and PtCl4.2HCl, which upon reaction with excess of AgNO3 giv... Amongst FeCl3.3H2O, K3[Fe(CN)6] and [Co(NH3)6]Cl3, the spin-only magnetic moment value of the inner-orbital complex that absorbs light at shortest wav... If [Cu(H2O)4]2+ absorbs a light of wavelength 600 nm for d-d transition, then the value of octahedral crystal field splitting energy for [Cu(H2O)6]2+ ... In the cobalt-carbonyl complex : [Co2(CO)8], number of Co-Co bonds is "X" and terminal CO ligands is "Y". X + Y = ___________.... The sum of oxidation states of two silver ions in [Ag(NH3)2] [Ag(CN)2] complex is _____________. The number of optical isomers possible for [Cr(C2O4)3]3$$-$$is ____________. 1 mol of an octahedral metal complex with formula MCl3 . 2L on reaction with excess of AgNO3 gives 1 mol of AgCl. The denticity of Ligand L is _______... 3 moles of metal complex with formula Co(en)2Cl3 gives 3 moles of silver chloride on treatment with excess of silver nitrate. The secondary valency of... The number of geometrical isomers possible in triamminetrinitrocobalt (III) is X and in trioxalatochromate (III) is Y. Then the value of X + Y is ____... Three moles of AgCl get precipitated when one mole of an octahedral co-ordination compound with empirical formula CrCl3.3NH3.3H2O reacts with excess o... The total number of unpaired electrons present in [Co(NH3)6]Cl2 and [Co(NH3)6]Cl3 is ... An aqueous solution of NiCl2 was heated with excess sodium cyanide in presence of strong oxidizing agent to form [Ni(CN)6]2$$-$$. The total change in ... The spin-only magnetic moment value for the complex [Co(CN)6]4$$-$$is __________ BM.[At. no. of Co = 27] The total number of unpaired electrons present in the complex K3[Cr(oxalate)3] is _____________. [Ti(H2O)6]3+ absorbs light of wavelength 498 nm during a d$$-$$d transition. The octahedral splitting energy for the above complex is ____________ ... The equivalents of ethylene diamine required to replace the neutral ligands from the coordination sphere of the trans-complex of CoCl3 . 4NH3 is _____... The number of stereoisomers possible for [Co(ox)2(Br)(NH3)]2$$-$$is ___________. [ox = oxalate] Number of bridging CO ligands in [Mn2(CO)10] is __________. The spin only magnetic moment of a divalent ion in aqueous solution (atomic number 29) is _________ BM. Considering that$$\Delta 0 > P, the magnetic moment (in BM) of [Ru(H2O)6]2+ would be _________.
The total number of coordination sites in ethylenediaminetetraacetate (EDTA4–) is _____.
The oxidation states of iron atoms in compounds (A), (B) and (C), respectively, are x, y and z. The sum of x, y and z is ________. Na4[Fe(CN)5(NOS)] &...
Complexes (ML5) of metals Ni and Fe have ideal square pyramidal and trigonal bipyramidal grometries, respectively. The sum of the 90°, 120° and 180° L...
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