JEE Chemistry Coordination Compounds MCQs Set 31

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Multiple Choice Questions

Question 1: The structure of \( \ce{[Pt(NH3)4]^{2+}} \) is:
(a) tetrahedral
(b) pyramidal
(c) pentagonal
(d) square planar
Show Answer & Explanation

Answer: (d) square planar

Explanation:
1. Pt2+ is \( d8 \) and, being \( 5d \), forms dsp2 square planar complexes.

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 2: The oxidation state of Mo in the oxido-complex species \( \ce{[Mo2O4(C2H4)2(H2O)2]^{2-}} \) is:
(a) +2
(b) +4
(c) +3
(d) +5
Show Answer & Explanation

Answer: (c) +3

Explanation:
1. Oxide is \( -2 (x4 = -8) \), while ethene and water are neutral. For two Mo: \( 2x - 8 = -2 \), so \( x = +3 \).

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 3: Among these, the complex with the highest stability is:
(a) \( \ce{[Fe(H2O)6]^{3+}} \)
(b) \( \ce{[FeCl6]^{3-}} \)
(c) \( \ce{[Fe(CN)6]^{3-}} \)
(d) \( \ce{[Fe(C2O4)3]^{3-}} \)
Show Answer & Explanation

Answer: (c) \( \ce{[Fe(CN)6]^{3-}} \)

Explanation:
1. Cyanide forms an extremely stable hexacyano complex with Fe3+ (overall \( \log \beta \) about 43), more than oxalate, water or chloride.

Teacher's Note:
1. Strong field ligands with high charge density form very stable complexes.

Question 4: What is the crystal field stabilisation energy for a d5 configuration in a tetrahedral complex (high spin)?
(a) 0.0
(b) 0.4
(c) -2
(d) +2
Show Answer & Explanation

Answer: (a) 0.0

Explanation:
1. \( e2 t2^3 \): \( 2(-0.6) + 3(+0.4) = 0 \).

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 5: One mole of \( \ce{Co(NH3)5Cl3} \) gives 3 moles of ions in water, and reacts with two moles of AgNO3 to give two moles of AgCl. The structure is:
(a) \( \ce{[Co(NH3)4Cl]Cl2.NH3} \)
(b) \( \ce{[Co(NH3)5Cl]Cl2} \)
(c) \( \ce{[Co(NH3)3Cl]Cl2.2NH3} \)
(d) \( \ce{[Co(NH3)4Cl2]Cl.NH3} \)
Show Answer & Explanation

Answer: (b) \( \ce{[Co(NH3)5Cl]Cl2} \)

Explanation:
1. Three ions with two precipitable Cl- indicates [Co(NH3)5Cl]2+ and 2 Cl-.

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 6: Which of the following are correct? (1) [Ag(NH3)2]+ is linear with sp-hybridised Ag+; (2) NiCl4 2-, VO4 3- and MnO4- are tetrahedral; (3) [Cu(NH3)4]2+, [Pt(NH3)4]2+ and [Ni(CN)4]2- have dsp2 hybridisation of the metal ion.
(a) (1) only
(b) (1) and (2) only
(c) (2) and (3) only
(d) All are correct
Show Answer & Explanation

Answer: (d) All are correct

Explanation:
1. All three statements are standard facts about these complexes (square planar dsp2 in (3)).

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 7: Which kind of isomerism is exhibited by octahedral [Co(NH3)4Br2]Cl?
(a) Geometrical and optical
(b) Optical and ionisation
(c) Geometrical and ionisation
(d) Geometrical only
Show Answer & Explanation

Answer: (c) Geometrical and ionisation

Explanation:
1. cis and trans forms (geometrical) exist, and exchanging Cl- with Br- gives ionisation isomers. Neither isomer is chiral.

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 8: The bond length in CO is 1.128 A. The bond length of CO in \( \ce{Fe(CO)5} \) is likely to be:
(a) 1.128 A
(b) 1.078 A
(c) 1.158 A
(d) 1.118 A
Show Answer & Explanation

Answer: (c) 1.158 A

Explanation:
1. Back donation from Fe \( d \) orbitals into the CO \( \pi\cdot \) orbital lowers the \( C-O \) bond order, so the bond lengthens beyond \( 1.128 A \).

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 9: How many moles of AgCl are obtained when \( \ce{Co(NH3)5Cl3} \) is treated with excess AgNO3?
(a) 1 mol
(b) 2 mol
(c) 3 mol
(d) no precipitate
Show Answer & Explanation

Answer: (b) 2 mol

Explanation:
1. The compound is [Co(NH3)5Cl]Cl2 (coordination number 6). Only the two ionisable chloride ions precipitate.

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 10: Which is true for the complex \( \ce{Co(NO2)(Cl)2.5NH3} \) (Co is +3)?
(a) It shows ionisation isomerism only
(b) All of these
(c) It is an inner orbital complex only
(d) It is diamagnetic only
Show Answer & Explanation

Answer: (b) All of these

Explanation:
1. The complex is [Co(NH3)5(NO2)]Cl2, which shows ionisation isomerism, uses d2sp3 (inner orbital) and has no unpaired electron \( (t2g6) \).

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 11: What is wrong about the compound \( \ce{K[Pt(eta2-C2H4)Cl3]} \)?
(a) The oxidation number of Pt is +4
(b) It is Zeise's salt
(c) It is a pi-bonded complex
(d) Four ligands surround the platinum atom
Show Answer & Explanation

Answer: (a) The oxidation number of Pt is +4

Explanation:
1. Charge: \( x + 0 - 3 = -1 \) gives \( x = +2 \).

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 12: Which of the following metal carbonyls are inner orbital complexes with diamagnetic property? (i) Ni(CO)4 (ii) Fe(CO)5 (iii) V(CO)6 (iv) Cr(CO)6
(a) (ii) and (iv)
(b) (i) and (ii)
(c) (ii), (iii) and (iv)
(d) (i), (ii) and (iv)
Show Answer & Explanation

Answer: (a) (ii) and (iv)

Explanation:
1. Fe(CO)5 (dsp3) and Cr(CO)6 (d2sp3) use inner \( d \) orbitals and are diamagnetic. Ni(CO)4 is sp3 (outer), and V(CO)6 is paramagnetic.

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 13: \( \ce{[Pt(NH3)(NH2OH)(NO2)(Py)]+} \) (square planar) will form how many geometrical isomers?
(a) 3
(b) 2
(c) 0
(d) 5
Show Answer & Explanation

Answer: (a) 3

Explanation:
1. Square planar Mabcd has 3 geometrical isomers.

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 14: Which of the following shows the maximum molar conductance?
(a) \( \ce{[Co(NH3)3Cl3]} \)
(b) \( \ce{[Co(NH3)4Cl2]Cl} \)
(c) \( \ce{[Co(NH3)6]Cl3} \)
(d) \( \ce{[Co(NH3)5Cl]Cl2} \)
Show Answer & Explanation

Answer: (c) \( \ce{[Co(NH3)6]Cl3} \)

Explanation:
1. It gives four ions (1 cation \( + 3 \) Cl-), the most among the options.

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 15: The number of geometrical isomers of \( \ce{[Co(NH3)3(NO2)3]} \) is:
(a) 0
(b) 2
(c) 3
(d) 4
Show Answer & Explanation

Answer: (b) 2

Explanation:
1. Ma3b3: facial and meridional isomers.

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 16: The total number of stereoisomers possible for \( \ce{[Co(en)2Cl2]} \) is:
(a) 2
(b) 3
(c) 4
(d) 5
Show Answer & Explanation

Answer: (b) 3

Explanation:
1. trans (1, achiral) plus cis (\( a \) pair of enantiomers) = 3.

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 17: On adding AgNO3 solution to a solution of \( \ce{[Pt(NH3)3Cl3]Cl} \), the percentage of total chloride ion precipitated by AgNO3 is:
(a) 100
(b) 25
(c) 75
(d) 50
Show Answer & Explanation

Answer: (b) 25

Explanation:
1. Four chlorides in total, of which only the one outside the sphere precipitates: 1/4 = 25%.

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 18: What is the charge on the complex \( \ce{[Cr(C2O4)2(H2O)2]} \) formed by Cr(III)?
(a) -1
(b) +3
(c) +1
(d) +2
Show Answer & Explanation

Answer: (a) -1

Explanation:
1. Charge = \( +3 + 2(-2) + 0 = -1 \).

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 19: Which of the following orders is not correct?
(a) Spin-only magnetic moment: \( \ce{[Cr(NH3)6]^{3+}} \) > \( \ce{[Mn(CN)6]^{3-}} \) > \( \ce{V(CO)6} \)
(b) Delta0: \( \ce{[Co(CN)6]^{3-}} \) > \( \ce{[Co(NH3)6]^{3+}} \) > \( \ce{[Co(H2O)6]^{3+}} \)
(c) Stability: \( \ce{[Ni(NH3)6]^{2+}} \) < \( \ce{[Ni(en)(NH3)4]^{2+}} \) < \( \ce{[Ni(en)3]^{2+}} \)
(d) M-C pi bond strength: \( \ce{Ni(CO)4} \) > \( \ce{[Co(CO)4]-} \) > \( \ce{[Fe(CO)4]^{2-}} \)
Show Answer & Explanation

Answer: (d) M-C pi bond strength: \( \ce{Ni(CO)4} \) > \( \ce{[Co(CO)4]-} \) > \( \ce{[Fe(CO)4]^{2-}} \)

Explanation:
1. Back bonding grows with negative charge on the metal, so the \( M-C \pi \) bond strength order is Fe(CO)4 2- > Co(CO)4- > Ni(CO)4, the reverse of the order given.

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 20: Which of the following names is impossible?
(a) Barium tetrafluoridochromate(II)
(b) Dichloridobis(urea)copper(II)
(c) All are possible
(d) Potassium tetrafluoridooxidochromate(VI)
Show Answer & Explanation

Answer: (d) Potassium tetrafluoridooxidochromate(VI)

Explanation:
1. Cr(VI) with \( O2- \) and four \( F- \) gives zero charge, so a potassium salt is not possible; the name suits a neutral CrOF4 only.

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 21: The ion \( \ce{[Sc(H2O)6]^{3+}} \) is:
(a) coloured and paramagnetic
(b) colourless and paramagnetic
(c) coloured and octahedral
(d) colourless and diamagnetic
Show Answer & Explanation

Answer: (d) colourless and diamagnetic

Explanation:
1. Sc3+ is \( d0 \): no \( d-d \) transitions and no unpaired electrons.

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 22: Which of the following statements is wrong? (a) Na2[Fe(CN)5NO] (b) [Fe(H2O)5NO]SO4 (c) K4[Fe(CN)6]
(a) (a) is used in the detection of S2-
(b) The complex part of each compound is octahedral
(c) The oxidation state of Fe in (a) and (b) is +1
(d) (c) is used in the detection of Fe3+
Show Answer & Explanation

Answer: (c) The oxidation state of Fe in (a) and (b) is +1

Explanation:
1. In \( (a) \) Fe is \( +2 \) (NO+). In \( (b) \) Fe is formally \( +1 \) (NO+ with charges balancing). So the statement is wrong for \( (a) \).

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 23: The crystal field stabilisation energy for the complex \( \ce{[Co(CN)6]^{3-}} \) is:
(a) +2.4 Delta0 + 3P
(b) -3.6 Delta0 + 3P
(c) -2.4 Delta0 + 2P
(d) -1.8 Delta0 + 3P
Show Answer & Explanation

Answer: (c) -2.4 Delta0 + 2P

Explanation:
1. Co3+ is \( d6 \) low spin: \( t2g6 \), so CFSE = \( 6(-0.4) Delta0 = -2.4 Delta0 \), and two extra pairing energies \( (2P) \) are needed.

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 24: In nitroprusside the iron and NO exist as Fe(II) and NO+ rather than Fe(III) and NO. These forms can be differentiated by:
(a) estimating the concentration of iron
(b) measuring the solid state magnetic moment
(c) measuring the concentration of CN-
(d) thermally decomposing the compound
Show Answer & Explanation

Answer: (b) measuring the solid state magnetic moment

Explanation:
1. Fe(II) low spin \( d6 \) with NO+ is diamagnetic, whereas Fe(III) with NO would be paramagnetic.

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 25: The number of isomers possible for the complex \( \ce{[Cr(NH3)3Cl3]} \) is:
(a) 3
(b) 4
(c) 2
(d) 5
Show Answer & Explanation

Answer: (c) 2

Explanation:
1. Ma3b3 octahedral: fac and mer.

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

Question 26: The formula of sodium nitroprusside is:
(a) \( \ce{Na2[Fe(CN)5NO]} \)
(b) \( \ce{Na4[Fe(CN)5NO2]} \)
(c) \( \ce{NaFe[Fe(CN)6]} \)
(d) \( \ce{Na2[Fe(CN)6NO2]} \)
Show Answer & Explanation

Answer: (a) \( \ce{Na2[Fe(CN)5NO]} \)

Explanation:
1. Nitroprusside is pentacyanonitrosylferrate(II), Na2[Fe(CN)5NO].

Teacher's Note:
1. Work out the oxidation state, coordination number and geometry step by step.

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