Chemistry - Coordination Compounds - Quiz-9

Which of the following statements is correct regarding the chirality (optical isomerism) of the cis and a trans isomer of the type $M {(aa)}_{2} b_{2}$ (M stands for metal, aa is a bidentate ligand, and b is a chiral ligand)?

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The trans form is achiral and optically inactive while the cis form is chiral and exists in two enantiomeric forms
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Both cis and transforms are achiral and optically inactive
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The transform is chiral and exists in two enantiomeric forms while the cis form is achiral and optically inactive
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Both the cis and transform are chiral and each exists in two enantiomeric form

Which statement about the coordination number of a cation is true?

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Metal ions exhibit only a single characteristic co-ordination number
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The coordination number is equal to the number of ligands bonded to the metal atom
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The coordination number is determined solely by the number of empty d-orbitals in the atom
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Coordination number is equal to the number of coordinate bonds between the metal cation and ligands

If ${Cd}^{2 +}$ and ${Cu}^{2 +}$ both are present, both are complexed by ${CN}^{-}$ and $H_{2} S$ gas is passed, which one of the following pairs of complexes and their relative stability enables the separation of ${Cu}^{2 +}$ and ${Cd}^{2 +}$ ?

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$K_{3} [Cu ({CN}_{4})]$ : more stable and $K_{2} [Cd ({CN}_{4})]$ : less stable
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$K_{2} [Cu ({CN}_{4})]$ : less stable and $K_{2} [Cd ({CN}_{4})]$ : more stable
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$K_{2} [Cu ({CN}_{4})]$ : more stable and $K_{2} [Cd ({CN}_{4})]$ : more stable
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$K_{3} [Cu ({CN}_{4})]$ : less stable and $K_{2} [Cd ({CN}_{4})]$ : more stable

The spin-only magnetic moments of ${[Mn {(CN)}_{6}]}^{4 -} and {[{MnBr}_{4}]}^{2 -}$ in Bohr Magnetons, respectively, are

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5.92 and 5.92
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4.89 and 1.73
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1.73 and 5.92
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1.73 and 1.73

The crystal field stabilization energies (CFSE) of high spin and low spin $d^{6}$ metal complexes in terms of $∆_{0}$ , respectively are

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-0.4 and -2.4
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-2.4 and -0.4
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-0.4 and 0.0
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-2.4 and 0.0

The oxidation state of cobalt in the following molecule is

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3
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1
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2
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0

For a tetrahedral complex ${[{MCI}_{4}]}^{2 -}$ , the spin-only magnetic moment is 3.83 B.M. The element M is

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Co
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Cu
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Mn
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Fe

Among the following, the species that is both tetrahedral and diamagnetic is

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${[{NiCl}_{4}]}^{2 -}$
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${[Ni {(CN)}_{4}]}^{2 -}$
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$[Ni {(CO)}_{4}]$
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${[Ni {(H_{2} O)}_{6}]}^{2 +}$

The number of ions produced in water by the dissolution of the complex having the empirical formula is $[CO {({NH}_{3})}_{4} {Cl}_{2}] CI$ is

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3
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1
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2
0%

4

The spin-only magnetic moments of ${[Fe {({NH}_{3})}_{6}]}^{3 +} and {[{FeF}_{6}]}^{3 -}$ in BM are, respectively,

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1.73 and 1.73
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5.92 and 1.73
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1.73 and 5.92
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5.92 and 5.92

In aqueous solution, ${[Co {(H_{2} O)}_{6}]}^{2 +}$ (X) reacts with molecular oxygen in the presence of excess liquor $N H_{3}$ to give a new complex Y. The number of unpaired electrons in X and Y are, respectively

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3,1
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3,0
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3,3
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7,0

The energies of $d_{xy} and {d_{z}}^{2}$ orbitals in octahedral and tetrahedral transition metal complexes are such that

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$E (d_{xy}) > E (d_{z^{2}})$ in both tetrahedral and octahedral complexes
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$E (d_{xy}) < E (d_{z^{2}})$ in both tetrahedral and octahedral complexes
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$E (d_{xy}) > E (d_{z^{2}})$ in tetrahedral but $E (d_{xy}) < E (d_{z^{2}})$ in octahedral complexes
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$E (d_{xy}) < E (d_{z^{2}})$ in tetrahedral but $E (d_{xy}) > E (d_{z^{2}})$ in octahedral complexes

The number of geometrical isomers of $[{CrCl}_{2} (en) {({NH}_{3})}_{2}]$ are
[en-ethylenediamine]

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2
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3
0%

4
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1

The geometry and the number of the unpaired electron(s) of ${[{MnBr}_{4}]}^{2 -}$ , respectively, are

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Tetrahedral and 1
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Square planar and 1
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Tetrahedral and 5
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Square planar and 5

Among the following complexes, the one that can exhibit optical activity is

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${[{CoCl}_{6}]}^{3 -}$
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${[Co (en) {CI}_{4}]}^{-}$
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$cis - {[Co {(en)}_{2} {Cl}_{2}]}^{+}$
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trans- ${[Co {(en)}_{2} {Cl}_{2}]}^{+}$

2.335 g of compound X (empirical formal ${CoH}_{12} N_{4} {Cl}_{3}$ ) upon treatment with excess ${AgNO}_{3}$ solution produces 1.435 g of a white precipitate. The primary and secondary valences of cobalt in compound X, respectively, will be

[Given Atomic mass: Co = 59, Cl = 35.5, Ag = 108]

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3, 6
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3, 4
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2, 4
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4, 3

The geometry and magnetic property of ${[{NiCl}_{4}]}^{2 -}$ , respectively, are

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Tetrahedral, Paramagnetic
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Tetrahedral, Diamagnetic
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Square planar, Paramagnetic
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Square planar, Diamagnetic

$Among (i) {[Cr {(en)}_{3}]}^{3 +}, (ii) trans - {[Cr {(en)}_{2} {Cl}_{2}]}^{+}, (iii) cis - {[Cr {(en)}_{2} {Cl}_{2}]}^{+}, (iv) {[Co {({NH}_{3})}_{4} Cl]}^{+}, the optically active complexes are$

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(i) (ii) and (iii)
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(i) and (iii)
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(ii) and (iii)
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(ii) and (iv)

Among the following complexes, the one that can exist as facial (fac) and meridional (mer) isomers is

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$[Co {({NO}_{2})}_{3} {({NH}_{3})}_{3}]$
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$K_{3} [Fe {(CN)}_{6}]$
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$[Co {(H_{2} O)}_{2} {({NH}_{3})}_{4}] {CI}_{3}$
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$[CoCl {({NH}_{3})}_{5}] CI$

The total number of geometrical isomers possible for an octahedral complex of the type $[{MA}_{2} B_{2} C_{2}]$ are
(M = transition metal; A, B and C are monodentate ligands)

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3
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4
0%

5
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6

The IUPAC name of $[Co (ONO) {({NH}_{3})}_{5}] {Cl}_{2}$ is

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Pentamminenitrocobalt(II)chloride
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Pentamminenitrsoocobalt(III)chloride
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Pentaaminenitrito -O-cobalt(III)chloride.
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Pentammineoxo-nitrocobalt(III)chloride

The metal carbonyl which is paramagnetic is

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Ni ${(CO)}_{4}$
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V ${(CO)}_{6}$
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Cr ${(CO)}_{6}$
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Fe ${(CO)}_{5}$

When any solution passes through a cation exchange resin that is in acidic form,

$H^{+}$ ion of the resin is replaced by cations of the solution. A solution containing 0.319 g of an isomer with molecular formula

${CrCl}_{3} . 6 H_{2} O$ is passed through a cation exchange resin in acidic form. The eluated solution requires 19

${cm}^{3}$ of 0.125 N NaOH. The isomer is

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Triaquatrichloro chromium(lll) chloride trihydrate
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Hexaaqua chromium(lll) chloride
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Pentaaquamonochloro chromium(lll) chloride monohydrate
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Tetraaquadichloro chromium(lll) chloride dehydrate

The incorrect statement about ammonium cerium (IV) nitrate,

${({NH}_{4})}_{2} [Ce {({NO}_{3})}_{6}] is$

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${NO}_{3}^{-}$ acts as a monodentate ligand.
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The Ce atom has a coordination number of 12.
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The shape of the complex ion is an icosahedron.
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The solution is used as an oxidizing agent.

Which one of the following reactions is correct?

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$[Fe (CO)_{5}] + 2 NO \to [Fe (CO)_{2} (NO)_{2}] + 3 CO$
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$[Fe (CO)_{5}] + 2 NO \to [Fe (CO)_{3} (NO)_{2}] + 2 CO$
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$[Fe (CO)_{5}] + 3 NO \to [Fe (CO)_{2} (NO)_{3}] + 3 CO$
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$[Fe (CO)_{5}] + 3 NO \to [Fe (CO)_{3} (NO)_{3}] + 2 CO$

How many isomers are possible for complex ${[Co {(O X)}_{2} {Cl}_{2}]}^{+}$

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1
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3
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2
0%

4

When excess of KCN is added to a solution of CuSO₄, the final product obtained is,

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K₂[Cu(CN)₄]
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K₃[Cu(CN)₄]
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CuCN
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K[Cu(CN)₂]

The complex that can exhibit linkage isomerism is

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$[Co {({NH}_{3})}_{5} (H_{2} O)] C l_{3}$
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$[C o {(N H_{3})}_{5} (N O_{2})] C l_{2}$
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$[Co {({NH}_{3})}_{5} ({NO}_{3})] {(N O_{3})}_{2}$
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$[CO {({NH}_{3})}_{5} Cl] S O_{4}$

Which of the following has both fac-mer and optical isomers?

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$[Co {({NH}_{3})}_{5} {({NO}_{3})}_{}]$
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${[Co {(e n)}_{3}]}^{3 -}$
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$[Co {(gly)}_{3}]$
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none of these

Coordination number is maximum in

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$[Co {({NH}_{3})}_{6}]^{+ 3}$
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${[Cr {(C_{2} O_{4})}_{3}]}^{3 -}$
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$[{CoCl}_{3} {(H_{2} O)}_{3}]$
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All of the above have the same coordination number

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Practice Chemistry Quiz Questions and Answers

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Practice Chemistry Quiz Questions and Answers

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