JEE Chemistry Coordination Compounds MCQs Set 33

Download JEE MCQs for JEE Chemistry: Coordination Compounds

Review structured MCQ sets for JEE Chemistry Coordination Compounds. Built according to official JEE guidelines, these downloadable questions support daily revision and core concept reinforcement.

Chapter-wise Objective Questions: Coordination Compounds

Navigate directly to the 50 objective questions for Coordination Compounds using the digital viewer below. Each practice set includes verified answer keys, allowing students to instantly cross-check their work and identify areas requiring further revision.

Multiple Choice Questions

Question 1: When CrCl3·6H2O is treated with excess AgNO3, 3 mol of AgCl are obtained per mole. The formula of the complex is:
(a) [CrCl3(H2O)3]·3H2O
(b) [CrCl2(H2O)4]Cl·2H2O
(c) [CrCl(H2O)5]Cl2·H2O
(d) [Cr(H2O)6]Cl3
Show Answer & Explanation

Answer: (d) [Cr(H2O)6]Cl3

Explanation:
1. All three chloride ions precipitate, so all are ionisable and outside the coordination sphere.
2. Hence the complex is [Cr(H2O)6]Cl3.
3. Answer: (d)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 2: Which complex ion shows geometrical isomerism?
(a) [Cr(H2O)4Cl2]+
(b) [Pt(NH3)3Cl]
(c) [Co(NH3)6]3+
(d) [Co(CN)5(NC)]3-
Show Answer & Explanation

Answer: (a) [Cr(H2O)4Cl2]+

Explanation:
1. An octahedral Ma4b2 complex has cis and trans forms.
2. Ma6 and Ma5b cannot show geometrical isomerism, and a 3-coordinate Pt(II) species is not a normal square planar complex.
3. Answer: (a)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 3: Which complex formed by Cu2+ ions is the most stable?
(a) [Cu(NH3)4]2+
(b) [Cu(H2O)4]2+
(c) [Cu(en)2]2+
(d) [Cu(CN)4]2-
Show Answer & Explanation

Answer: (c) [Cu(en)2]2+

Explanation:
1. Ethane-1,2-diamine (en) is a bidentate chelating ligand.
2. Chelate rings give extra stability (chelate effect), so [Cu(en)2]2+ is the most stable.
3. Answer: (c)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 4: The compounds [Co(SO4)(NH3)5]Br and [Co(SO4)(NH3)5]Cl represent:
(a) Linkage isomerism
(b) Ionisation isomerism
(c) Coordination isomerism
(d) No isomerism
Show Answer & Explanation

Answer: (d) No isomerism

Explanation:
1. Isomers must have the same molecular formula.
2. These two compounds have different counter ions (Br and Cl), so their formulae differ and they are not isomers.
3. Answer: (d)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 5: Which of the following complexes is optically active?
(a) [Co(en)3]3+
(b) trans-[Co(en)2Cl2]+
(c) cis-[Co(en)2Cl2]+
(d) Both [Co(en)3]3+ and cis-[Co(en)2Cl2]+
Show Answer & Explanation

Answer: (d) Both [Co(en)3]3+ and cis-[Co(en)2Cl2]+

Explanation:
1. Optical activity needs the absence of a plane of symmetry.
2. [Co(en)3]3+ and the cis form of [Co(en)2Cl2]+ are non-superimposable on their mirror images, while the trans form has a plane of symmetry.
3. Answer: (d)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 6: A complex has the composition CoBr2Cl·4NH3. Conductivity shows two ions per formula unit, and silver nitrate gives an immediate precipitate of AgCl but no AgBr. The structural formula is:
(a) [CoBrCl(NH3)4]Br
(b) [CoCl(NH3)4]Br2
(c) [CoBr2Cl(NH3)4]
(d) [CoBr2(NH3)4]Cl
Show Answer & Explanation

Answer: (d) [CoBr2(NH3)4]Cl

Explanation:
1. Only Cl- precipitates with Ag+, so Cl is outside the coordination sphere and both Br are inside.
2. This gives [CoBr2(NH3)4]Cl, which has two ions per formula unit.
3. Answer: (d)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 7: In the tetraammine complex of Cu2+, the hybridisation of copper (as taken in the textbook model) is:
(a) sp3
(b) sp2d
(c) sp3d2
(d) dsp2
Show Answer & Explanation

Answer: (d) dsp2

Explanation:
1. [Cu(NH3)4]2+ is square planar.
2. The textbook model promotes one \( 3d \) electron and uses dsp2 hybridisation.
3. Answer: (d)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 8: Which complex has the highest paramagnetism?
(a) [Cr(H2O)6]3+
(b) [Fe(H2O)6]2+
(c) [Cu(H2O)6]2+
(d) [Zn(H2O)6]2+
Show Answer & Explanation

Answer: (b) [Fe(H2O)6]2+

Explanation:
1. Unpaired electrons: Cr3+ d3 = 3, Fe2+ d6 (high spin) = 4, Cu2+ d9 = 1, Zn2+ d10 = 0.
2. Fe2+ has the most, so highest paramagnetism.
3. Answer: (b)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 9: Which of the following compounds has its total number of stereoisomers correctly matched?
(a) [Co(en)3]Cl3 - 3
(b) [Co(en)2Cl2]Cl - 2
(c) [Co(NH3)3Cl3] - 2
(d) [Pt(NH3)2Cl2] - 3
Show Answer & Explanation

Answer: (c) [Co(NH3)3Cl3] - 2

Explanation:
1. [Co(en)3]3+: 2 (a pair of enantiomers). [Co(en)2Cl2]+: 3 (trans \( + a \) cis pair).
2. [Co(NH3)3Cl3]: 2 (fac and mer). [Pt(NH3)2Cl2]: 2 (cis, trans).
3. Answer: (c)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 10: When excess ammonia is added to CuSO4 solution, a deep blue complex is formed. The complex is:
(a) Tetrahedral and paramagnetic
(b) Tetrahedral and diamagnetic
(c) Square planar and diamagnetic
(d) Square planar and paramagnetic
Show Answer & Explanation

Answer: (d) Square planar and paramagnetic

Explanation:
1. The complex is [Cu(NH3)4]2+, square planar.
2. Cu2+ is d9 with one unpaired electron, so it is paramagnetic.
3. Answer: (d)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 11: Which of the following has the maximum number of isomers?
(a) [Co(NH3)4Cl2]+
(b) [Ni(en)(NH3)4]2+
(c) [Ni(C2O4)(en)2]0
(d) [Cr(SCN)2(NH3)4]+
Show Answer & Explanation

Answer: (d) [Cr(SCN)2(NH3)4]+

Explanation:
1. [Co(NH3)4Cl2]+ has 2 isomers, [Ni(en)(NH3)4]2+ has 1, [Ni(C2O4)(en)2] has 2 (optical).
2. In [Cr(SCN)2(NH3)4]+ cis/trans combined with \( S/N \) linkage options give 6 isomers.
3. Answer: (d)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 12: Which of the following coordination entities is chiral (optically active)?
(a) [Cr(H2O)6]3+
(b) trans-[CrCl2(ox)2]3-
(c) cis-[CrCl2(NH3)4]+
(d) cis-[CrCl2(ox)2]3-
Show Answer & Explanation

Answer: (d) cis-[CrCl2(ox)2]3-

Explanation:
1. Only the cis form of an M(AA)2b2 complex lacks a plane of symmetry.
2. cis-[CrCl2(NH3)4]+ is Ma4b2, which has planes of symmetry.
3. Answer: (d)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 13: Amongst the following, the most stable complex is:
(a) [Fe(H2O)6]3+
(b) [Fe(C2O4)3]3-
(c) [Fe(NH3)6]3+
(d) [FeCl4]-
Show Answer & Explanation

Answer: (b) [Fe(C2O4)3]3-

Explanation:
1. Oxalate is a bidentate chelating ligand, forming three five-membered rings.
2. The chelate effect makes this complex the most stable.
3. Answer: (b)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 14: Which of the following is an organometallic compound?
(a) cis-Platin
(b) Zeise's salt
(c) Tollen's reagent
(d) Sodium nitroprusside
Show Answer & Explanation

Answer: (b) Zeise's salt

Explanation:
1. An organometallic compound has at least one metal-carbon bond to an organic group.
2. Zeise's salt K[PtCl3(C2H4)] has a Pt-ethene bond.
3. Answer: (b)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 15: Which of the following systems has the maximum spin-only magnetic moment?
(a) d5 (octahedral, Δo > P)
(b) d8 (tetrahedral)
(c) d6 (high spin)
(d) d9 (octahedral)
Show Answer & Explanation

Answer: (c) d6 (high spin)

Explanation:
1. Unpaired electrons: low spin d5 = 1, d8 = 2, high spin d6 = 4, d9 = 1.
2. d6 high spin has the most.
3. Answer: (c)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 16: In the brown ring complex, the oxidation state of iron is:
(a) +2
(b) +3
(c) +1
(d) 0
Show Answer & Explanation

Answer: (c) +1

Explanation:
1. The brown ring is [Fe(H2O)5(NO)]2+.
2. NO is present as NO+, so \( x + 1 = +2 \) and \( x = +1 \).
3. Answer: (c)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 17: The geometries of [Ni(CO)4] and [Ni(PPh3)2Cl2] are:
(a) Both square planar
(b) Tetrahedral and square planar
(c) Both tetrahedral
(d) Square planar and tetrahedral
Show Answer & Explanation

Answer: (c) Both tetrahedral

Explanation:
1. Ni(0) in Ni(CO)4 is sp3, tetrahedral.
2. [Ni(PPh3)2Cl2] is a tetrahedral Ni(II) complex with weak field Cl- and bulky PPh3.
3. Answer: (c)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 18: Geometrical isomerism can be shown by:
(a) [Ag(CN)(NH3)]
(b) Na2[Cd(NO2)4]
(c) [PtCl4I2]2-
(d) [PtCl(NH3)3][Au(CN)4]
Show Answer & Explanation

Answer: (c) [PtCl4I2]2-

Explanation:
1. [PtCl4I2]2- is octahedral of type Ma4b2, so cis and trans forms exist.
2. A linear complex and a tetrahedral complex of type M(NO2)4 cannot show it.
3. Answer: (c)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 19: Which of the following will give a pair of enantiomorphs?
(a) [Cr(NH3)6][Co(CN)6]
(b) [Co(en)2Cl2]Cl
(c) [Pt(NH3)4][PtCl6]
(d) [Co(NH3)4Cl2]NO2
Show Answer & Explanation

Answer: (b) [Co(en)2Cl2]Cl

Explanation:
1. The cis form of [Co(en)2Cl2]+ has no plane of symmetry and exists as a pair of enantiomers.
2. The other options have symmetric structures.
3. Answer: (b)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 20: Among the following, the coloured compound is:
(a) CuCl
(b) K3[Cu(CN)4]
(c) CuF2
(d) [Cu(CH3CN)4]BF4
Show Answer & Explanation

Answer: (c) CuF2

Explanation:
1. Colour from \( d-d \) transitions needs a partly filled \( d \) subshell.
2. Cu+ (d10) in the other three has none, while Cu2+ (d9) in CuF2 does.
3. Answer: (c)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 21: [NiCl4]2- and [Ni(CN)4]2- resemble in:
(a) Geometry
(b) Magnetic nature
(c) Hybridisation
(d) Oxidation state
Show Answer & Explanation

Answer: (d) Oxidation state

Explanation:
1. [NiCl4]2- is tetrahedral, paramagnetic (sp3), but [Ni(CN)4]2- is square planar, diamagnetic (dsp2).
2. Both contain Ni in the \( +2 \) state.
3. Answer: (d)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 22: The CFSE of a high spin d4 octahedral complex is:
(a) -0.6 Δo
(b) -1.8 Δo
(c) -1.6 Δo + P
(d) -1.2 Δo
Show Answer & Explanation

Answer: (a) -0.6 Δo

Explanation:
1. High spin d4 is t2g3eg1.
2. CFSE = \( 3(-0.4) + 1(+0.6) = -0.6 \) Δo.
3. Answer: (a)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 23: Which ion would you expect to have the maximum splitting of d-orbitals?
(a) [Fe(CN)6]4-
(b) [Fe(CN)6]3-
(c) [Fe(H2O)6]2+
(d) [Fe(H2O)6]3+
Show Answer & Explanation

Answer: (b) [Fe(CN)6]3-

Explanation:
1. CN- gives a larger splitting than H2O.
2. Between the two cyanide complexes, Fe3+ (higher charge, smaller radius) has the larger Δo.
3. Answer: (b)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 24: Match each compound with its total number of stereoisomers: (A) [Co(en)2Cl2]+ (B) [Co(en)3]Cl3 (C) [Pt(NH3)2Cl2] (D) [Pt(NH3)3Cl3]+ with (P) 2 (Q) 3 (R) 4 (S) 5
(a) A-R, B-P, C-R, D-R
(b) A-Q, B-P, C-P, D-P
(c) A-P, B-R, C-P, D-P
(d) A-Q, B-Q, C-P, D-P
Show Answer & Explanation

Answer: (b) A-Q, B-P, C-P, D-P

Explanation:
1. [Co(en)2Cl2]+ has 3 (trans + cis pair).
2. [Co(en)3]3+, square planar [Pt(NH3)2Cl2] and octahedral [Pt(NH3)3Cl3]+ (fac, mer) each have 2.
3. Answer: (b)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 25: The correct formula of diamminedichloridodicyanochromate(III) is:
(a) [CrCl2(CN)2(NH3)2]3+
(b) [CrCl2(CN)2(NH3)2]3-
(c) [CrCl2(CN)2(NH3)2]
(d) [CrCl2(CN)2(NH3)2]-
Show Answer & Explanation

Answer: (d) [CrCl2(CN)2(NH3)2]-

Explanation:
1. Charge = \( +3 + 2(-1) + 2(-1) + 0 = -1 \).
2. So the complex is the anion [CrCl2(CN)2(NH3)2]-, consistent with the suffix -ate.
3. Answer: (d)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 26: The correct IUPAC name of [Cr(C6H6)(CO)3] is:
(a) (η6-Benzene)tricarbonylchromium(0)
(b) Tricarbonyl(η6-benzene)chromate(0)
(c) Tricarbonyl(η6-benzene)chromium(0)
(d) (η6-Benzene)tricarbonylchromate(0)
Show Answer & Explanation

Answer: (a) (η6-Benzene)tricarbonylchromium(0)

Explanation:
1. Ligands are named alphabetically: benzene before carbonyl (prefix tri- is ignored).
2. The complex is neutral, so the metal is named chromium(0).
3. Answer: (a)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 27: Zeise's salt is:
(a) Fe(η5-C5H5)2
(b) Cr(η6-C6H6)2
(c) K[Pt(η2-C2H4)Cl3]
(d) K[Pt(η2-C2H4)2Cl2]
Show Answer & Explanation

Answer: (c) K[Pt(η2-C2H4)Cl3]

Explanation:
1. Zeise's salt is potassium trichlorido(η2-ethene)platinate(II).
2. The other two named formulas are ferrocene and dibenzenechromium.
3. Answer: (c)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 28: The coordination number of calcium is six in:
(a) [Ca(EDTA)]2-
(b) CaC2O4
(c) [Ca(C2O4)2]2-
(d) CaSO4·2H2O
Show Answer & Explanation

Answer: (a) [Ca(EDTA)]2-

Explanation:
1. EDTA is hexadentate, so it gives coordination number 6.
2. Two oxalate ligands would give only 4.
3. Answer: (a)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 29: The hybridisation, shape and magnetic moment of K3[Co(CO3)3] are:
(a) d2sp3, octahedral, 4.9 BM
(b) sp3d2, octahedral, 4.9 BM
(c) dsp2, square planar, 4.9 BM
(d) sp3, tetrahedral, 4.9 BM
Show Answer & Explanation

Answer: (b) sp3d2, octahedral, 4.9 BM

Explanation:
1. Co is \( +3 \) (d6) and carbonate is a weak field ligand, so the complex is high spin.
2. Four unpaired electrons give \( \sqrt{4 x 6} = 4.9 \) BM, with sp3d2 octahedral geometry.
3. Answer: (b)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 30: Which of the following statements is correct?
(a) With d2sp3 hybridisation [FeCl(CN)4(O2)]4- is diamagnetic
(b) [NiCl4]2- is more stable than [Ni(dmg)2]
(c) [V(CO)6] is not very stable and easily reduces to [V(CO)6]-
(d) Ligands such as CO, CN- and NO+ are pi-donors
Show Answer & Explanation

Answer: (c) [V(CO)6] is not very stable and easily reduces to [V(CO)6]-

Explanation:
1. [V(CO)6] has 17 valence electrons, so it readily gains one electron to reach the 18-electron anion.
2. The chelate [Ni(dmg)2] is more stable than [NiCl4]2-, and CO, CN-, NO+ are pi-acceptors.
3. Answer: (c)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 31: If Hx[PtY6] is a complex acid in which Pt is +4 and Y is a monodentate negatively charged ligand, the value of x is:
(a) 5
(b) 3
(c) 6
(d) None of these
Show Answer & Explanation

Answer: (d) None of these

Explanation:
1. The anion is [PtY6]2-, since \( 4 - 6 = -2 \).
2. So 2 H+ are needed and \( x = 2 \), which is not listed.
3. Answer: (d)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

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