Coordination Compounds

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