Chapter 23

Consider the complex ions, trans-[Co(en) \(\left._{2} \mathrm{Cl}_{2}\right]^{+} \quad\) (A) and cis\(\left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]^{+}(\mathrm{B})\). The correct statement regarding them is : (a) both (A) and (B) cannot be optically active. (b) (A) can be optically active, but (B) cannot be optically active. (c) both (A) and (B) can be optically active. (d) (A) cannot be optically active, but (B) can be optically active.

The species that has a spin-only magnetic moment of \(5.9 \mathrm{BM}\), is : \(\left(\mathrm{T}_{\mathrm{d}}\right.\) = tetrahedral) (a) \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\) (square planar) (b) \(\left[\mathrm{NiCl}_{4}\right]^{2-}\left(\mathrm{T}_{d}\right)\) (c) \(\mathrm{Ni}(\mathrm{CO})_{4}\left(\mathrm{~T}_{\mathrm{d}}\right)\) (d) \(\left[\mathrm{MnBr}_{4}\right]^{2-}\left(\mathrm{T}_{\mathrm{d}}\right)\)

The complex that can show optical activity is: (a) trans-[Cr(Cl_{2} ) ( o x ) _ { 2 } ] ^ { 3 - } (b) trans- \(\left[\mathrm{Fe}\left(\mathrm{NH}_{3}\right)_{2}(\mathrm{CN})_{4}\right]^{-}\) (c) cis- \(\left[\mathrm{Fe}\left(\mathrm{NH}_{3}\right)_{2}(\mathrm{CN})_{4}\right]^{-}\) (d) cis- \(\left[\mathrm{CrCl}_{2}(\mathrm{ox})_{2}\right]^{3-} \quad\) (ox \(=\) oxalate)

Complex A has a composition of \(\mathrm{H}_{12} \mathrm{O}_{6} \mathrm{Cl}_{3} \mathrm{Cr}\). If the complex on treatment with conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) loses \(13.5 \%\) of its original mass, the correct molecular formula of \(\mathrm{A}\) is : [Given: atomic mass of \(\mathrm{Cr}=52 \mathrm{amu}\) and \(\mathrm{Cl}=35 \mathrm{amu}]\) (a) \(\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{3}\) (b) \(\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{3} \mathrm{Cl}_{3}\right] \cdot 3 \mathrm{H}_{2} \mathrm{O}\) (c) \(\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{5} \mathrm{Cl}\right] \mathrm{Cl}_{2} \cdot \mathrm{H}_{2} \mathrm{O}\) (d) \(\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4} \mathrm{Cl}_{2}\right] \mathrm{Cl} \cdot 2 \mathrm{H}_{2} \mathrm{O}\)

The values of the crystal field stabilization energies for a high spin \(d^{6}\) metal ion in octahedral and tetrahedral fields, respectively, are : (a) \(-0.4 \Delta_{0}\) and \(-0.6 \Delta_{\mathrm{t}}\) (b) \(-2.4 \Delta_{\mathrm{o}}\) and \(-0.6 \Delta_{\mathrm{t}}\) (c) \(-1.6 \Delta_{0}\) and \(-0.4 \Delta_{t}\) (d) \(-0.4 \Delta_{\mathrm{o}}\) and \(-0.27 \Delta_{\mathrm{r}}\)

The one that is not expected to show isomerism is : (a) \(\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{4}\left(\mathrm{H}_{2} \mathrm{O}\right)_{2}\right]^{2+}\) (b) \(\left[\mathrm{Ni}(\mathrm{en})_{3}\right]^{2+}\) (c) \(\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right]\) (d) \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right]\)

The pair in which both the species have the same magnetic moment (spin only) is: (a) \(\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\) and \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\) (b) \(\left[\mathrm{Co}(\mathrm{OH})_{4}\right]^{2-}\) and \(\left[\mathrm{Fe}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}\) (c) \(\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\) and \(\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)\right]^{2+}\) (d) \(\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\) and \(\left[\mathrm{CoCl}_{4}\right]^{2-}\)

Complex \(\mathrm{X}\) of composition \(\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6} \mathrm{Cl}_{\mathrm{n}}\) has a spin only magnetic moment of \(3.83 \mathrm{BM}\). It reacts with \(\mathrm{AgNO}_{3}\) and shows geometrical isomerism. The IUPAC nomenclature of \(\mathrm{X}\) is: (a) Hexaaqua chromium (III) chloride (b) Tetraaquadichlorido chromium (IV) chloride dihydrate (c) Dichloridotetraaqua chromium (IV) chloride dihydrate (d) Tetraaquadichlorido chromium (III) chloride dihydrate

The isomer(s) of \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right]\) that has/have a \(\mathrm{Cl}-\mathrm{Co}-\mathrm{Cl}\) angle of \(90^{\circ}\), is/are : (a) meridional and trans (b) cis and trans (c) trans only (d) cis only

The one that can exhibit highest paramagnetic behaviour among the following is: gly \(=\) glycinato; bpy \(=2,2\) '-bipyridine (a) \(\left[\mathrm{Pd}(\mathrm{gly})_{2}\right]\) (b) \(\left[\mathrm{Fe}(\mathrm{en})(\mathrm{bpy})\left(\mathrm{NH}_{3}\right)_{2}\right]^{2+}\) (c) \(\left[\mathrm{Co}(\mathrm{OX})_{2}(\mathrm{OH})_{2}\right]^{-}\left(\Delta_{0}>\mathrm{P}\right)\) (d) \(\left[\mathrm{Ti}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\)

The complex that can show fac-and \(m e r\) - isomers is: (a) \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right]^{+}\) (b) \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right]\) (c) \(\left[\mathrm{CoCl}_{2}(\mathrm{en})_{2}\right]\) (d) \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{3}\left(\mathrm{NO}_{2}\right)_{3}\right]\)

The electronic spectrum of \(\left[\mathrm{Ti}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}\) shows a single broad peak with a maximum at \(20,300 \mathrm{~cm}^{-1}\). The crystal field stabilization energy (CFSE) of the complex ion, in \(\mathrm{kJ} \mathrm{mol}^{-1}\), is : \(\left(1 \mathrm{~kJ} \mathrm{~mol}^{-1}=83.7 \mathrm{~cm}^{-1}\right)\) (a) \(145.5\) (b) \(242.5\) (c) \(83.7\) (d) 97

Among (a) - (d), the complexes that can display geometrical isomerism are: (1) \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{3} \mathrm{Cl}\right]^{+}\) (2) \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right) \mathrm{Cl}_{5}\right]^{-}\) (3) \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}\left(\mathrm{NO}_{2}\right)\right]\) (4) \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{ClBr}\right]^{2+}\) (a) (2) and (3) (b) \((4)\) and (l) (c) (3) and (4) (d) (1) and (2)

The IUPAC name of the complex \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}\left(\mathrm{NH}_{2} \mathrm{CH}_{3}\right)\right] \mathrm{Cl}\) is: (a) Diamminechlorido (methanamine) platinum (II)chloride (b) Diammine (methanamine) chlorido platinum (II)chloride (c) Diamminechlorido (aminomethane) platinum (II)chloride (d) Bisammine (methanamine) chlorido platinum (II)chloride

Consider that a \(d^{6}\) metal ion \(\left(\mathrm{M}^{2+}\right)\) forms a complex with aqua ligands, and the spin only magnetic moment of the complex is \(4.90 \mathrm{BM}\). The geometry and the crystal field stabilization energy of the complex is : (a) octahedral and \(-2.4 \Delta_{0}+2 \mathrm{P}\) (b) tetrahedral and \(-0.6 \Delta_{\text {t }}\) (c) octahedral and \(-1.6 \Delta_{0}\) (d) tetrahedral and \(-1.6 \Delta_{\mathrm{t}}+1 \mathrm{P}\)

The number of possible optical isomers for the complexes \(\mathrm{MA}_{2} \mathrm{~B}_{2}\) with \(s p^{3}\) and \(d s p^{2}\) hybridized metal atom, respectively, is: Note: A and \(\mathrm{B}\) are unidentate neutral and unidentate monoanionic ligands, respectively. (a) 0 and 2 (b) 2 and 2 (c) 0 and 0 (d) 0 and 1

For octahedral Mn(II) and tetrahedral Ni(II) complexes, consider the following statements: (I) both the complexes can be high spin. (II) Ni(II) complex can very rarely below spin. (III) with strong field ligands, Mn(II) complexes can be low spin. (IV) aqueous solution of \(\mathrm{Mn}(\mathrm{II})\) ions is yellow in color. The correct statements are : (a) (I) and (II) only (b) (I), (III) and (IV) only (c) (I), (II) and (III) only (d) (II), (III) and (IV) only

Among the statements (A)-(D), the incorrect ones are: (A) Octahedral Co(III) complexes with strong field ligands have very high magnetic moments. (B) When \(\square_{0}<\mathrm{P}\), the \(d\)-electron configuration of \(\mathrm{Co}(\mathrm{III})\) in an octahedral complex is \(t_{2 \mathrm{~g}}^{4} e_{\mathrm{g}}^{2}\) (C) Wavelength of light absorbed by \(\left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+}\) is lower than that of \(\left[\mathrm{CoF}_{6}\right]^{3-}\) (D) If the \(\square_{0}\) for an octahedral complex of \(\mathrm{Co}(\mathrm{III})\) is \(18,000 \mathrm{~cm}^{-1}\), the \(\square_{t}\) for its tetrahedral complex with the same ligand will be \(16,000 \mathrm{~cm}^{-1}\). (a) (A) and (D) only (b) (C) and (D) only (c) (A) and (B) only (d) (B) and (C) only

The coordination numbers of \(\mathrm{Co}\) and \(\mathrm{Al}\) in \(\left[\mathrm{Co}(\mathrm{Cl})(\mathrm{en})_{2}\right] \mathrm{Cl}\) and \(\mathrm{K}_{3}\left[\mathrm{Al}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]\), respectively, are : (en \(=\) ethane- 1, 2-diamine) (a) 5 and 3 (b) 3 and 3 (c) 6 and 6 (d) 5 and 6

The coordination number of \(\mathrm{Th}\) in \(\mathrm{K}_{4}\left[\mathrm{Th}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{4}\left(\mathrm{H}_{2} \mathrm{O}\right)_{2}\right]\) is: \(\left(\mathrm{C}_{2} \mathrm{O}_{4}^{2-}=\right.\) oxalato) (a) 14 (b) 6 (c) 8 (d) 10

The theory that can completely/properly explain the nature of bonding in \(\left[\mathrm{Ni}(\mathrm{CO})_{4}\right]\) is: (a) Werner's theory (b) Molecular orbital theory (c) Crystal field theory (d) Valence bond theory

A reaction of cobalt(III) chloride and ethylenediamine in a \(1: 2\) mole ratio generates two isomeric products A (violet coloured) and B (green coloured). A can show optical activity, but, \(\mathrm{B}\) is optically inactive. What type of isomers does \(\mathrm{A}\) and \(\mathrm{B}\) represent? (a) Geometrical isomers (b) Coordination isomers (c) Linkage isomers (d) Ionisation isomers

The compound used in the treatment of lead poisoning is : (a) D-penicillamine (b) desferrioxime B (c) cis-platin (d) EDTA

Consider the following reaction and statements: \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Br}_{2}\right]^{+}+\mathrm{Br}^{-} \rightarrow\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{3} \mathrm{Br}_{3}\right]+\mathrm{NH}_{3}\) (I) Two isomers are produced if the reactant complex ion is a cis-isomer. (II) Two isomers are produced if the reactant complex ion is a trans isomer (III)Only one isomer is produced if the reactant complex ion is a trans isomer (IV) Only one isomer is produced if the reactant complex ion is a cis-isomer. The correct statements are: (a) (I) and (II) (b) (I) and (III) (c) (III) and (IV) (d) (II) and (IV)

The degenerate orbitals of \(\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}\) are: (a) \(d_{x z}\) and \(d_{y z}\) (b) \(d_{y z}\) and \(d_{z}^{2}\) (c) \(d_{z} 2\) and \(d_{x z}\) (d) \(d_{x^{2}-y}^{2}\) and \(d_{x y}\)

The total number of possible isomers for square-planar \(\left[\mathrm{Pt}(\mathrm{Cl})\left(\mathrm{NO}_{2}\right)\right.\) \(\left.\left(\mathrm{NO}_{3}\right)(\mathrm{SCN})\right]^{2-}\) is: (a) 16 (b) 12 (c) 8 (d) 24

The correct order of the spin-only magnetic moment of metal ions in the following low-spin complexes, \(\left[\mathrm{V}(\mathrm{CN})_{6}\right]^{4-},\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-},\left[\mathrm{Ru}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\), and \(\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}\), is (a) \(\mathrm{Cr}^{2+}>\mathrm{Ru}^{3+}>\mathrm{Fe}^{2+}>\mathrm{V}^{2+}\) (b) \(\mathrm{V}^{2+}>\mathrm{Cr}^{2+}>\mathrm{Ru}^{3+}>\mathrm{Fe}^{2+}\) (c) \(\mathrm{V}^{2+}>\mathrm{Ru}^{3+}>\mathrm{Cr}^{2+}>\mathrm{Fe}^{2+}\) (d) \(\mathrm{Cr}^{2+}>\mathrm{V}^{2+}>\mathrm{Ru}^{3+}>\mathrm{Fe}^{2+}\)

On treatment of \(100 \mathrm{~mL}\) of \(0.1 \mathrm{M}\) solution of \(\mathrm{CoCl}_{3} .6 \mathrm{H}_{2} \mathrm{O}\) with excess \(\mathrm{AgNO}_{3} ; 1.2 \times 10^{22}\) ions are precipitated. The complex is: (a) \(\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4} \mathrm{Cl}_{2}\right] \mathrm{Cl} .2 \mathrm{H}_{2} \mathrm{O}\) (b) \(\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{3} \mathrm{Cl}_{3}\right] .3 \mathrm{H}_{2} \mathrm{O}\) (c) \(\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{3}\) (d) \(\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{5} \mathrm{Cl}\right] \mathrm{Cl}_{2} \cdot \mathrm{H}_{2} \mathrm{O}\)

\(\mathrm{Mn}_{2}(\mathrm{CO})_{10}\) is an organometallic compound due to the presence of : (a) Mn-C bond (b) Mn-Mn bond (c) Mn-O bond (d) C-O bond

Which one of the following complexes shows optical isomerism? (a) trans \(\left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right] \mathrm{Cl}\) (b) \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right] \mathrm{Cl}\) (c) \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{3} \mathrm{Cl}_{3}\right]\) (d) \(\mathrm{cis}\left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right] \mathrm{Cl}\) (en \(=\) ethylenediamine)

Which of the following is an example of homoleptic complex? (a) \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right] \mathrm{Cl}_{3}\) (b) \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right]\) (c) \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right]\) (d) \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Cl}\right] \mathrm{Cl}_{2}\)

The number of bridging CO ligand(s) and Co-Co bond(s) in \(\mathrm{Co}_{2}(\mathrm{CO})_{8}\), respectively are:[Main Jan. \(\left.11,2019(\mathrm{II})\right]\) (a) 2 and 1 (b) 2 and 0 (c) 0 and 2 (d) 4 and 0

The number of geometric isomers that can exist for square planar complex \(\left[\mathrm{Pt}(\mathrm{Cl})(\mathrm{py})\left(\mathrm{NH}_{3}\right)\left(\mathrm{NH}_{2} \mathrm{OH}\right)\right]^{+}\)is \((\mathrm{py}=\) pyridine \()\) : (a) 4 (b) 6 (c) 2 (d) 3

Wilkinson catalyst is: (a) \(\left[\left(\mathrm{Ph}_{3} \mathrm{P}\right)_{3} \mathrm{IrCl}\right]\) (b) \(\left[\left(\mathrm{Et}_{3} \mathrm{P}\right)_{3} \mathrm{RhCl}\right]\) (c) \(\left[\left(\mathrm{Ph}_{3} \mathrm{P}\right)_{3} \mathrm{RhCl}\right]\) (d) \(\left[\left(\mathrm{Et}_{3} \mathrm{P}\right)_{3} \mathrm{IrCl}\right]\)

The correct statement on the isomerism associated with the following complex ions, (A) \(\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{5} \mathrm{NH}_{3}\right]^{2+}\), (B) \(\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\left(\mathrm{NH}_{3}\right)_{2}\right]^{2+}\) and (C) \(\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{3}\left(\mathrm{NH}_{3}\right)_{3}\right]^{2+}\) is : (a) (A) and (B) show only geometrical isomerism (b) (A) and (B) show geometrical and optical isomerism (c) (B) and (C) show geometrical and optical isomerism (d) (B) and (C) show only geometrical isomerism

The complex that has highest crystal field splitting energy \((\Delta)\) is: (a) \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5}\left(\mathrm{H}_{2} \mathrm{O}\right)\right] \mathrm{Cl}_{3}\) (b) \(\mathrm{K}_{2}\left[\mathrm{CoCl}_{4}\right]\) (c) \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Cl}\right] \mathrm{Cl}_{2}\) (d) \(\mathrm{K}_{3}\left[\mathrm{Co}(\mathrm{CN})_{6}\right]\)

An octahedral complex with molecular composition M.5 \(\mathrm{NH}_{3} \cdot \mathrm{Cl} \cdot \mathrm{SO}_{4}\) has two isomers, \(\mathrm{A}\) and \(\mathrm{B}\). The solution of A gives a white precipitate with \(\mathrm{AgNO}_{3}\) solution and the solution of B gives white precipitate with \(\mathrm{BaCl}_{2}\) solution. The type of isomerism exhibited by the complex is: (a) Linkage isomerism (b) Ionisation isomerism (c) Coordinate isomerism (d) Geometrical isomerism

In Wilkinson's catalyst, the hybridisation of central metal ion and its shape are respectively: (a) \(s p^{3} d\), trigonal bipyramidal (b) \(d^{2} s p^{3}\), octahedral (c) \(d s p^{2}\), square planar (d) \(s p^{3}\), tetrahedral

Which of the following complex species is not expected to exhibit optical isomerism ? (a) \(\left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+}\) (b) \(\left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]^{+}\) (c) \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{3} \mathrm{Cl}_{3}\right]\) (d) \(\left[\mathrm{Co}(\mathrm{en})\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right]^{+}\)

\(\left[\mathrm{Co}_{2}(\mathrm{CO})_{8}\right]\) displays: (a) one Co-Co bond, six terminal \(\mathrm{CO}\) and two bridging CO (b) one Co-Co bond, four terminal \(\mathrm{CO}\) and four bridging \(\mathrm{CO}\) (c) no Co - Co bond, six terminal \(\mathrm{CO}\) and two bridging \(\mathrm{CO}\) (d) no Co- Co bond, four terminal \(\mathrm{CO}\) and four bridging \(\mathrm{CO}\)

Type of isomerism which exists between \(\left[\mathrm{Pd}\left(\mathrm{C}_{6} \mathrm{H}_{5}\right)_{2}(\mathrm{SCN})_{2}\right]\) and \(\left[\mathrm{Pd}\left(\mathrm{C}_{6} \mathrm{H}_{5}\right)_{2}(\mathrm{NCS})_{2}\right]\) is : (a) Linkage isomerism (b) Coordination isomerism (c) Ionisation isomerism (d) Solvate isomerism

The pair having the same magnetic moment is: [At. No.: \(\mathrm{Cr}=24, \mathrm{Mn}=25, \mathrm{Fe}=26, \mathrm{Co}=27]\) (a) \(\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\) and \(\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\) (b) \(\left[\mathrm{CoCl}_{4}\right]^{2-}\) and \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\) (c) \(\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\) and \(\left[\mathrm{CoCl}_{4}\right]^{2-}\) (d) \(\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\) and \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\)

As per IUPAC nomenclature, the name of the complex \(\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\left(\mathrm{NH}_{3}\right)_{2}\right] \mathrm{Cl}_{3}\) is : (a) Tetraaquadiaminecobalt (III) chloride (b) Tetraaquadiamminecobalt (III) chloride (c) Diaminetetraaquacoblat (II) chloride (d) Diamminetetraaquacobalt (III) chloride

The geometries of the ammonia complexes of \(\mathrm{Ni}^{2+}, \mathrm{Pt}^{2+}\) and \(\mathrm{Zn}^{2+}\) respectively, are (a) octahedral, square planar and tetrahedral (b) square planar, octahedral and tetrahedral (c) tetrahedral, square planar and octahedral (d) octahedral, tetrahedral and square planar

Which of the following compounds is not colored yellow? (a) \(\left(\mathrm{NH}_{4}\right)_{3}\left[\mathrm{As}\left(\mathrm{Mo}_{3} \mathrm{O}_{10}\right)_{4}\right]\) (b) \(\mathrm{BaCrO}_{4}\) (c) \(\mathrm{Zn}_{2}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\) (d) \(\mathrm{K}_{3}\left[\mathrm{Co}\left(\mathrm{NO}_{2}\right)_{6}\right]\)

The ionisation isomer of \(\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4} \mathrm{Cl}\left(\mathrm{NO}_{2}\right)\right] \mathrm{Cl}\) is (a) \(\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\left(\mathrm{O}_{2} \mathrm{~N}\right)\right] \mathrm{Cl}_{2}\) (b) \(\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4} \mathrm{Cl}_{2}\right]\left(\mathrm{NO}_{2}\right)\) (c) \(\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4} \mathrm{Cl}(\mathrm{ONO})\right] \mathrm{Cl}\) (d) \(\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4} \mathrm{Cl}_{2}\left(\mathrm{NO}_{2}\right)\right] \cdot \mathrm{H}_{2} \mathrm{O}\)

The color of \(\mathrm{KMnO}_{4}\) is due to : (a) \(\mathrm{L} \rightarrow \mathrm{M}\) charge transfer transition (b) \(\sigma-\sigma^{*}\) transition (c) \(\mathrm{M} \rightarrow \mathrm{L}\) charge transfer transition (d) \(\mathrm{d}-\mathrm{d}\) transition

The IUPAC name of \(\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{4}\right]\left[\mathrm{NiCl}_{4}\right]\) is (a) Tetrachloronickel (II) - tetraamminenickel (II) (b) Tetraamminenickel (II) - tetrachloronickel (II) (c) Tetraamminenickel (II) - tetrachloronickelate (II) (d) Tetrachloronickel (II) - tetrachloronickelate (0) Ans. (C)

Which molecule/ion among the following cannot act as a ligand in complex compounds? (a) \(\mathrm{CH}_{4}\) (b) \(\mathrm{CO}\) (c) \(\mathrm{CN}^{-}\) (d) \(\mathrm{Br}^{-}\)

Which kind of isomerism is exhibited by octahedral \(\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Br}_{2} \mathrm{Cl} ?\) (a) Geometrical and Ionization (b) Geometrical and Optical (c) Optical and Ionization (d) Geometrical only