Coordination Compounds

The complexes [Co(NH3)6][Cr(CN)6] and [Cr(NH3)6][Co(CN)6] are the examples of which type of isomerism?

1. Linkage isomerism
2. Ionization isomerism
3. Coordination isomerism
4. Geometrical isomerism

The complex, [Pt(Py)(NH3)BrCl] will have how many geometrical isomers?

1. 3
2. 4
3. 0
4. 2

The d-electron configurations of Cr2+, Mn2+, Fe2+ and Co2+ are d4, d5, d6 and d7 respectively. Which one of the following will exhibit minimum paramagnetic behaviour? (At. Nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

1. [Mn(H2O)6]2+
2. [Fe(H2O)6]2+
3. [Co(H2O)6]2+
4. [Cr(H2O)6]2+

Which of the following carbonyls will have the strongest C–O bond?

1. Mn(CO)6+
2. Cr(CO)6
3. V(CO)6-
4. Fe(CO)5

Which of the following complex compounds will exhibit highest paramagnetic behaviour?

1. [Ti(NH3)6]3+
2. [Cr(NH3)6]3+
3. [Co(NH3)6]3+
4. [Zn(NH3)6]2+

Which of the following complex ions is not expected to absorb visible light?

1. [Ni(CN)4]2-
2. [Cr(NH3)6]3+
3. [Fe(H2O)6]2+
4. [Ni(H2O)6]2+

Crystal field stabilization energy for high spin d4 octahedral complex is

1. -1.8 0
2. -1.6 0 + P
3. -1.2 0
4. -0.6 0

The existence of two different coloured complexes with the composition of [Co(NH3)4Cl2]+ is due to

1. linkage isomerism
2. geometrical isomerism
3. coordination isomerism
4. ionization isomerism.

Which one of the following complexes is not expected to exhibit isomerism?

1. [Ni(NH3)4(H2O)2]2+
2. [Pt(NH3)2Cl2]
3. [Ni(NH3)2Cl2]
4. [Ni(en)3]2+

Which of the following does not show optical isomerism? (en = ethylenediamine)

1. [Co(NH3)3Cl3]0
2. [Co(en)Cl2(NH3)2]+
3. [Co(en)3]3+
4. [Co(en)2Cl2]+

Which of the following complex ions is expected to absorb visible light? (At. nos. Zn = 30, Sc = 21, Ti = 22, Cr = 24)

1. [Ti(en)2(NH3)2]4+
2. [Cr(NH3)6]3+
3. [Zn(NH3)6]2+
4. [Sc(H2O)3(NH3)3]3+

Which of the following complexes exhibits the highest paramagnetic behaviour? where gly = glycine, en = ethylenediamine and bpy = bipyridyl moieties. (At. nos. Ti = 22, V = 23, Fe = 26, Co = 27)

1. [Co(ox)2(OH)2]-
2. [Ti(NH3)6]3+
3. [V(gly)2(OH)2(NH3)2]+
4. [Fe(en)(bpy)(NH3)2]2+

In which of the following coordination entities the magnitude of o (CFSE in octahedral field) will be maximum? (At. No. Co = 27)

1. [Co(CN)6]3-
2. [Co(C2O4)3]3-
3. [Co(H2O)6]3+
4. [Co(NH3)6]3+

Which of the following will give a pair of enantiomorphs? (en = NH2CH2CH2NH2)

1. [Cr(NH3)6][Co(CN)6]
2. [Co(en)2Cl2]Cl
3. [Pt(NH3)4][PtCl6]
4. [Co(NH3)4Cl2]NO2

The d electron configurations of Cr2+, Mn2+, Fe2+ and Ni2+ are 3d4, 3d5, 3d6 and 3d8 respectively. Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour? (At. No. Cr = 24, Mn = 25, Fe = 26, Ni = 28)

1. [Fe(H2O)6]2+
2. [Ni(H2O)6]2+
3. [Cr(H2O)6]2+
4. [Mn(H2O)6]2+

[Cr(H2O)6]Cl3 (At. no. of Cr = 24) has a magnetic moment of 3.83 B.M. The correct distribution of 3d electrons in the chromium of the complex is

1. 3d1xy, 3d1yz, 3d1z2
2. 3d1(x2-y2), 3d1z2, 3d1xz
3. 3d1xy, 3d1(x2-y2), 3d1yz
4. 3d1xy, 3d1yz, 3d1xz

[Co(NH3)4(NO2)2]Cl exhibits

1. linkage isomerism, geometrical isomerism and optical isomerism
2. linkage isomerism, ionization isomerism and optical isomerism
3. linkage isomerism, ionization isomerism and geometrical isomerism
4. ionization isomerism, geometrical isomerism and optical isomerism.

Which one of the following is an inner orbital complex as well as diamagnetic in behaviour?

1. [Zn(NH3)6]2+
2. [Cr(NH3)6]3+
3. [Co(NH3)6]3+
4. [Ni(NH3)6]2+

Which one of the following is expected to exhibit optical isomerism? (en = ethylenediamine)

1. cis-[Pt(NH3)2Cl2]
2. trans-[Pt(NH3)2Cl2]
3. cis-[Co(en)2Cl2]+
4. trans-[Co(en)2Cl2]+

Which of the following coordination compounds would exhibit optical isomerism?

1. Pentaamminenitrocobalt (III) iodide
2. Diamminedichloroplatinum (II)
3. trans-Dicyanobis (ethylenediamine) chromium (III) chloride
4. tris-(Ethylenediamine) cobalt (III) bromide.

Among [Ni(CO)4], [Ni(CN)4]2-, [NiCl4]2- species, the hybridisation states at the Ni atom are, respectively [Atomic number of Ni = 28]

1. sp3, dsp2, dsp2
2. sp3, dsp2, sp3
3. sp3, sp3, dsp2
4. dsp2, sp3, sp3

CN- is a strong field ligand. This is due to the fact that

1. it carries negative charge
2. it is a pseudohalide
3. it can accept electrons from metal species
4. it forms high spin complexes with metal species.

Considering H2O as a weak field ligand, the number of unpaired electrons in [Mn(H2O)6]2+ will be (atomic number of Mn = 25)

1. three
2. five
3. two
4. four

Which of the following does not have a metal carbon bond?

1. Al(OC2H5)3
2. C2H5MgBr
3. K[Pt(C2H4)Cl3]
4. Ni(CO)4

In an octahedral structure, the pair of d orbitals involved in d2sp3 hybridisation is

1. dx2-y2, dz2
2. dxz, dx2-y2
3. dz2, dxz
4. dxy, dyz

Which of the following is considered to be an anticancer species?

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Vitamin B12 contains

1. Fe(II)
2. Co(III)
3. Zn(II)
4. Ca(II)

The number of unpaired electrons in the complex ion [CoF6]3- is (Atomic no. : Co = 27)

1. 2
2. 3
3. 4
4. zero

Among the following which is not the -bonded organometallic compound?

1. K[PtCl3( 2-C2H4)]
2. Fe( 5-C5H5)2
3. Cr( 6-C6H6)2
4. (CH3)4Sn

Atomic number of Cr and Fe are respectively 24 and 26, which of the following is paramagnetic with the spin of electron?

1. [Cr(CO)6]
2. [Fe(CO)5]
3. [Fe(CN)6]4-
4. [Cr(NH3)6]3+