Coordination Compounds

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.