Coordination Compounds

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