Coordination Compounds — practice questions

173 curated practice questions from Coordination Compounds (Chemistry JEE Main, NTA Exams) — 80 medium, 88 easy, 5 hard. Every question includes the final answer free; step-by-step worked solutions with a free account.

• Given below are two statements: Statement I: A solution of [Ni(H 2 O) 6 ] 2+ is green in colour. Statement II: A…
• A solution containing 2.67 g of CoCl 3 .6NH 3 (molar mass = 267.5 g mol -1 ) is passed through a cation exchanger. The…
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. Assertion: Linkage…
• The effective atomic number for the complex ion [Ni(CN) 4 ] 2– is
• The compounds [Cr(H 2 O) 6 Cl 3 ], [Cr(H 2 O) 5 Cl]Cl 2 . H 2 O and [Cr(H 2 O) 4 Cl 2 ]Cl.2H 2 O exhibit
• The correct order of the number of unpaired electrons in the given complexes is A [ Fe ( CN )_ 6 ]^ 3- B [ FeF _ 6 ]^ …
• The hydrization states of the central atom in the complex ions [FeF 6 ] 3– , [Fe(H 2 O) 6 ] 3+ and [Ni(NH 3 ) 6 ] 2+ are
• Which of the following complex species is not expected to exhibit optical isomerism ?
• Which one of the following cyano complexes would exhibit the lowest value of paramagnetic behaviour? (At. no. Cr = 24…
• 1 L, 0.02 M solution of [Co(NH 3 ) 5 SO 4 ]Br is mixed with 1L, 0.02 M solution of [Co(NH 3 ) 5 Br]SO 4 . The resulting…
• Octahedral complexes of copper (II) undergo structural distortion (Jahn-Teller). Which one of the given copper (II)…
• Coordination compounds have great importance in biological systems. In this context which of the following statements…
• The crystal field theory considers the metal-ligand bond to be a _______ bond.
• Which of the following types of octahedral complexes will not exhibit geometrical isomerism (where M = metal, a, b =…
• The oxidation number of Fe in K 3 [Fe(CN) 5 NO] is
• Match List I with List II. List I Complex List II CFSE ( _ 0 ) A. [ Cu ( NH _ 3 )_ 6 ]^ 2+ I.-0.6 B. [ Ti ( H _ 2 O )_…
• Which of the following complex compounds exhibits geometrical isomerism?
• Given below are two statements: Statement I: Dimethyl glyoxime forms a six membered covalent chelate when treated with…
• The IUPAC name of the coordination compound K 3 [Fe(CN) 6 ] is:
• In which one of the following metal carbonyls, forms a bridge between metal atoms? (Jee Main 2024)
• EAN of the central atoms in complexes K _ 2 [ Ni ( CN _ 4 ] ], [ Cu [ NH _ 3 ]_ 4 ]^ 5 O _ 4 and K _ 2 [ PtCl l _ 6 ]…
• Which of the following pairs of structures represent facial and meridional isomers (geometrical isomers) respectively?
• Select the option with correct property – (Jee Main 2024)
• Element not present in Nessler’s reagent is (Jee Main 2023)
• Which of the following octahedral complex ions is diamagnetic ?
• The hybridization states of the central atom in the complexes Fe ( CN )_ 6 ^ 3- , Fe ( CN )_ 6 ^ 4- and Co ( NO _ 2 )_…
• The total number of stereoisomers for the complex [Cr(ox) 2 ClBr] 3– (where ox = oxalate) is: (Jee Main 2023)
• The correct order of ligands arranged in increasing field strength. (Jee Main 2024)
• The magnetic moment of K 3 [Fe(CN) 6 ] is found to be 1.7 BM. How many unpaired electron (s) is/are present per complex?
• White precipitate of AgCl dissolves in aqueous ammonia solution due to formation of: (JEE Main 2022)
• Among the properties ( A ) reducing ( B ) oxidising ( C ) complexing, the set of properties shown by CN – ion towards…
• Which one of the following has an optical isomer ? (en = ethylenediamine)
• Transition metal complex with highest value of crystal field splitting (∆ 0 ) will be (JEE Main 2022)
• The IUPAC name for the complex compound Li[AlH 4 ] is
• Match List-I with List-II. List-I (Complex ion) List-II (Spin only magnetic moment in B.M.) (A) [Cr(NH 3 ) 6 ] 3+ (I)…
• Number of complexes from the following with even number of unpaired "d" electrons are____________. [V(H 2 O) 6 ] 3+ …
• The octahedral complex of a metal ion M 3+ with four monodentate ligands L 1 , L 2 , L 3 and L 4 absorb wavelengths in…
• Ammonia forms complex ion [Cu(NH 3 ) 4 ] 2+ with copper ions in alkaline solution but not in acidic solution. What is…
• The primary and secondary valencies of cobalt respectively in [Co(NH 3 ) 5 Cl]Cl 2 are : (Jee Main 2023)
• The correct order of energy of absorption for the following metal complexes is (JEE Main 2022) A: [Ni(en) 3 ] 2+ , B…
• Which one of the following complex ions has geometrical isomers ?
• The organometallic compound formed during the purification of Ni by the Mond process is
• Which of the following types of square planar complexes can show geometrical isomerism (where M = metal, a, b = achiral…
• Match List I with List II: List I (Complexes) List II (Hybridisation) (A) [Ni(CO) 4 ] I. sp 3 (B) [Cu(NH 3 ) 4 ] 2+ II…
• The number of ions formed from a molecule of potassium ferrocyanide in aqueous solution is
• Which one of the following complexes is an outer orbital complex ? (Atomic numbers : Mn = 25, Fe = 26, Co = 27, Ni = 28)
• Choose the correct Statements from the following: (A) Ethane-1 2-diamine is a chelating ligand. (B) Metallic aluminium…
• The structures of Ni(CO) 4 and Ni(PPh 3 ) 2 Cl 2 are
• Which of the following complex is homoleptic? (Jee Main 2024)
• The pair [Co(NH 3 ) 5 NO 3 ]SO 4 and [Co(NH 3 ) 5 SO 4 ]NO 3 will exhibit
• A coordination compound of cobalt has the molecular formula containing five ammonia molecules, one nitro group and two…
• How many geometrical isomers are possible for the square planar complex [Pt(NO 2 )(py)(NH 3 )(NH 2 OH)]NO 2 ?
• The correct order of spin only magnetic moments for the following complex ions is (Jee Main 2023)
• The coordination number of Fe in K 4 [Fe(CN) 6 ] is
• Which of the following will have three stereoisomeric forms? (i) [Cr(NO 3 ) 3 (NH 3 ) 3 ] (ii) K 3 [Co(C 2 O 4 ) 3 ]…
• Given below are two statements: Statement I: N(CH 3 ) 3 and P(CH 3 ) 3 can act as ligands to form transition metal…
• What type of isomerism could you assign to the following pair of complex compounds? [Co(NH 3 ) 6 ][Cr(CN) 6 ] and…
• CuSO 4 when reacts with KCN forms CuCN which is insoluble in water. It is soluble in excess of KCN, due to formation of…
• Both Co 3 + and Pt 4 + have a coordination number of 6. Which of the following pairs of complexes will show…
• Which of the following complex ions is expected to absorb visible light?
• The correct sequence of ligands in the order of decreasing field strength is (Jee Main 2024)
• The number of complexes from the following with no electrons in the t 2 orbital is TiCl _ 4 [ MnO _ 4 ]^ - , [ FeO _ 4…
• Match List-I with List-II. List-I List-II (A) TiCl 4 (I) e^ 2 , t_ 2 ^ 0 (B) [FeO 4 ] 2– (II) e^ 4 , t_ 2 ^ 3 (C) [FeCl…
• The formula of the complex tris(ethylenediamine)cobalt(III)sulphate is:
• [Co(NH 3 ) 6 ] 3+ and [CoF 6 ] 3– are respectively known as: (Jee Main 2024)
• The complex with highest magnitude of crystal field splitting energy (∆ 0 ) is (Jee Main 2023)
• Which of the following complex ions obeys Sidgwick’s effective atomic number (EAN) rule?
• Given below are two statements. Statement I: In CuSO 4 .5H 2 O, Cu-O bonds are present. Statement II: In CuSO 4 .5H 2…
• Which of the following are the example of double salt? (A) FeSO 4 .(NH 4 )2SO 4 .6H 2 O (B) CuSO 4 .4NH 3 .H 2 O (C) K…
• To increase significantly the concentration of free Zn 2+ ion in a solution of the complex ion [Zn(NH 3 ) 4 ] 2+ Zn 2+…
• Given below are two statements: Statement I: [Ni(CN) 4 ] 2– is square planar and diamagnetic complex, with dsp 2…
• The complex cation which has two isomers is : (Jee Main 2023)
• The formation of the complex ion [Co(NH 3 ) 6 ] 3+ involves sp 3 d 2 hybridization of Co 3+ . Hence, the complex ion…
• Which among the following will be named as dibromidobis-(ethylenediamine) chromium (III) bromide ?
• Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A…
• Which of the following complex ions violates the EAN rule?
• The hypothetical complex Triamminediaquachlorocobalt(III)chloride can be represented by:
• The metal complex that is diamagnetic is (Atomic number : Fe, 26; Cu, 29) (JEE Main 2022)
• Chiral complex from the following is: Here en = ethylene diamine (Jee Main 2023)
• Cobalt chloride when dissolved in water forms pink colored complex X which has octahedral geometry. This solution on…
• The correct IUPAC name of [PtBr 2 (PMe 3 ) 2 ] is: (Jee Main 2024)
• Which one of the following has largest number of isomers ? (R = alkyl group, en = ethylenediamine)
• Among the properties, (A) reducing, (B) oxidizing, (C) complexing, the set of properties shown by CN – ion towards…
• The IUPAC name of K 3 [Co(C 2 O 4 ) 3 ] is:- (Jee Main 2023)
• Which of the following complex has a possibility to exist as meridional isomer? (Jee Main 2023)
• By how much percentage does the energy of e g orbitals increase by from the average field splitting energy in…
• Consider the following spatial arrangements of the octahedral complex ion [Co(NH 3 ) 4 Cl 2 ] + . array l III IV array…
• Match List – I with List – II List-I List-II (A) [PtCl 4 ] 2– (I) sp 3 d (B) BrF 5 (II) d 2 sp 3 (C) PCl 5 (III) dsp 2…
• Match List I with List II List I Complex List II Crystal Field splitting energy (A_ 0 ) A. [Ti(H 2 O) 6 ] 2+ I. –1.2 B…
• Which one of the following complexes will exhibit the least paramagnetic behaviour? [Atomic number, Cr = 24, Mn = 25…
• Identify from the following species in which d 2 sp 3 hybridization is shown by central atom: (Jee Main 2024)
• The octahedral diamagnetic low spin complex among the following is (Jee Main 2023)
• The oxidation states of Cr in[Cr(H 2 O) 6 ]Cl 3 , [Cr(C 6 H 6 ) 2 ] and K 2 [Cr(CN) 2 (O) 2 (O 2 )(NH 3 )] respectively…
• Given below are two statements: one is labelled as "Assertion A" and the other is labelled as "Reason R" Assertion A…
• The metal atom present in the complex MABXL (where A, B, X and L are unidentate ligands and M is metal) involves sp 3…
• Which of the following ions has the maximum magnetic moment ?
• The tris (ethylenediamine) cobalt (III) cation, [Co(en) 3 ] 3+ , can have
• An octahedral complex is formed when hybrid orbitals of the following type are involved:
• How many hydrate isomers are possible with the formula CrCl 3 .6H 2 O?
• Which one of the following has a square planar geometry ? (At. no. Co = 27, Ni = 28, Fe = 26, Pt = 78)
• Match List I with List II List I (Complex) List II (Hybridization) A Ni(CO) 4 I sp 3 B [Ni (CN) 4 ] 2– II sp 3 d 2 C…
• Which of the following is correct order of ligand field strength? (Jee Main 2023)
• Which of the following complexes will exhibit maximum attraction to an applied magnetic field? (Jee Main 2023)
• Which of the following cannot be explained by crystal field theory? (Jee Main 2023)
• The IUPAC name for the complex [Co (NO 2 ) (NH 3 ) 5 ] Cl 2 is
• What is true about complex and the oxidation state of iron formed during brown ring test?
• Given below are two statements: Statement I: PF 5 and BrF 5 both exhibit sp 3 d hybridization. Statement II: Both SF 6…
• The IUPAC name for the coordination compound Fe(C 5 H 5 ) 2 is
• In the complex ion [Fe(H 2 O) 5 NO] 2+
• Among [Ni(CO) 4 ], [Ni(CN) 4 ] 2– and [NiCl 4 ] 2–
• In which of the following octahedral complexes of Co (at no 27), will the magnitude of ∆ o be the highest?
• The set which does not have ambidentate ligand(s) is (Jee Main 2023)
• Which of the following complex is octahedral, diamagnetic and the most stable? (Jee Main 2023)
• The correct order of magnetic moments (spin only values in B.M.) is
• The oxidation number of Co in [Co(en) 3 ] 2 (SO 4 ) 3 is
• Tetrahedral complexes of the types of [Ma 4 ] and [Ma 3 b] (where M = metal, a, b = achiral ligands) are not able to…
• The coordination number of central metal atom in a complex is determined by
• If Ni 2+ is replaced by Pt 2+ in the complex [NiCl 2 Br 2 ] 2– , which of the following properties are expected to get…
• Which of the following facts about the complex [Cr(NH 3 ) 6 ]Cl 3 is wrong ?
• If an iron (III) complex with the formula [Fe(NH 3 ) x (CN) y ] – has no electron in its e.g. orbital, then the value…
• Which of the following complex ions/molecules of nickel is paramagnetic?
• Match List I with List II List I(Coordination entity) List II(Wavelength of light absorbed in nm) A. [CoCl(NH 3 ) 5 ]…
• Which of the following statements is correct with regard to a complex ion?
• Nickel (Z = 28) combines with a uninegative monodentate ligand X – to form a paramagnetic complex [NiX 4 ] 2– . The…
• The value of the ‘spin only’ magnetic moment for one of the following configurations is 2.84 BM. The correct one is
• Consider the following complexions. P = [Fe F 6 ] 3− Q = [V(H 2 O) 6 ] 2+ R = [Fe(H 2 O) 6 ] 2+ The correct order of…
• Which one among the following pairs of complex compounds indicates linkage isomerism?
• When potash alum is dissolved in water, the total number of ions produced is
• The following complexes. . ( C ) [ Co ( NH _ 3 )_ 5 ( H _ 2 O ) ]^ 3+ , ( D ) [ Cu ( H _ 2 O )_ 4 . ]^ 2+ The correct…
• Which of the following statements is correct regarding the chirality (optical isomerism) of the cis and trans isomers…
• The correct order of the spin-only magnetic moment of metal ions in the following low spin complexes, [V(CN) 6 ] 4- …
• Which of the following mixtures is known as Ziegler–Natta catalyst ?
• In the coordination compound, K 4 [Ni(CN) 4 ], the oxidation state of nickel is
• Arrange the following coordination compounds in the increasing order of magnetic moments. (Atomic numbers: Mn = 25: Fe…
• The coordination number of Pt in [Pt(NH 3 ) 4 Cl 2 ] is
• The number of unpaired d-electrons in [Co(H 2 O) 6 ] 3+ is (Jee Main 2024)
• Match List I with List II. List-I List-II (A) K 2 [Ni(CN) 4 ] (I) sp 3 (B) [Ni(CO) 4 ] (II) sp 3 d 2 (C) [Co(NH 3 ) 6…
• Match List-I with List-II. List-I (Complex ion) List-II (Electronic configuration) (A) [ a ( H _ 2 O )_ 6 ]^ 3+ (I) t_…
• Three complexes, [CoCl(NH 3 ) 5 ] 2+ (I), [Co(NH 3 ) 5 H 2 O] 3+ (II) and [Co(NH 3 ) 6 ] 3+ (III) absorb light in the…
• Among TiF _ 6 ^ 2- , CoF _ 6 ^ 3- , Cu _ 2 Cl _ 2 and NiCl _ 4 ^ 2- (atomic numbers of Ti = 22, Co = 27, Cu = 29, Ni =…
• The coordination number of Ag in [Ag(NH 3 ) 2 ]Cl is
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT-1…
• An octahedral complex with the formula CoCl _ 3 nNH _ 3 upon reaction with excess of AgNO _ 3 solution gives 2 moles of…
• Low oxidation state of metals in their complexes are common when ligands: (JEE Main 2022)
• Which one of the following coordination compounds exhibits ionization isomerism?
• The magnetic moment is measured in Bohr Magneton (BM). Spin only magnetic moment of Fe in [Fe(H 2 O) 6 ] 3+ and [Fe(CN)…
• Which of the following will have maximum stabilization due to crystal field? (JEE Main 2022)
• The magnetic moment (spin only) of [NiCl 4 ] 2– is
• The coordination environment of Ca 2+ ion in its complex with EDTA 4– is: (Jee Main 2024)
• The correct IUPAC name of K _ 2 MnO _ 4 is (Jee Main 2024)
• Type of isomerism shown by [Cr(NH 3 ) 5 NO 2 ]Cl 2 is
• The coordination number and the oxidation state of the element ‘E’ in the complex [E(en) 2 (C 2 O 4 )]NO 2 (where (en)…
• The hybridization and magnetic behaviour of cobalt ion in [Co(NH 3 ) 6 ] 3+ complex, respectively is (Jee Main 2023)
• The Cl – Co – Cl bond angle values in a fac- [Co(NH 3 ) 3 Cl 3 ] complex is/are: (Jee Main 2023)
• The complex that dissolves in water is (Jee Main 2023)
• The oxidation number of Cr in [Cr(C 6 H 6 ) 2 ] is
• Which of the following complex will show largest splitting of d-orbitals? (Jee Main 2023)
• Correct order of spin only magnetic moment of the following complex ions is: (Given At. No. Fe: 26, Co: 27) (Jee Main…
• The oxidation state of Cr in [Cr(NH 3 ) 4 Cl 2 ] + is:
• The effective atomic number for the complex ion [ Pd ( NH _ 3 )_ 6 ]^ 4+ is?
• The coordination geometry around the manganese in decacarbonyldimanganese (0) (Jee Main 2024)
• The neutral molecules or ions which coordinate with the central atom or ion in a complex ion are called
• Match List I with List II List I (Coordination complex) List II (Number of unpaired electrons) A. [Cr(CN) 6 ] 3– I. 0…
• Among the ligands NH 3 , en, CN – and CO, the correct order of their increasing field strength, is
• The calculated spin-only magnetic moments (BM) of the anionic and cationic species of [Fe(H 2 O) 6 ] 2 [Fe(CN) 6 ]…
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT-1…
• Co 2 + , CN ^ - and barium ions form complex. If the complex is supposed to be 75% ionised in water with vant hoff…
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion…
• The IUPAC name for the coordination compound Na 3 [Ag(S 2 O 3 ) 2 ] is
• One mole of the complex Compound Co (NH 3 ) 5 Cl 3 , gives 3 moles of ions on dissolution in water. One mole of the…
• Which of the following ligands can form an organometallic compound?
• Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R Assertion A: The…
• The correct statements from following are: A. The strength of anionic ligands can be explained by crystal field theory…

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