Coordination Compounds

What is the correct electronic configuration of the central atom in K4[Fe(CN)6] based on crystal field theory?

1. t2g4 eg2
2. t2g6 eg0
3. e3 t23
4. e4 t22

Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code :

1. (a)-(iv), (b)-(v), (c)-(ii), (d)-(i)
2. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
3. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
4. (a)-(iii), (b)-(v), (c)-(i), (d)-(ii)

The type of isomerism shown by the complex [CoCl2(en)2] is

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

The geometry and magnetic behaviour of the complex [Ni(CO)4] are

1. square planar geometry and diamagnetic
2. tetrahedral geometry and diamagnetic
3. square planar geometry and paramagnetic
4. tetrahedral geometry and paramagnetic

Iron carbonyl, Fe(CO)5 is

1. tetranuclear
2. mononuclear
3. trinuclear
4. dinuclear

An example of a sigma bonded organometallic compound is

1. Grignard's reagent
2. ferrocene
3. cobaltocene
4. ruthenocene.

The correct order of the stoichiometries of AgCl formed when AgNO3 in excess is treated with the complexes : CoCl3 6NH3, CoCl3 5NH3, CoCl3 4NH3 respectively is

1. 3AgCl, 1AgCl, 2AgCl
2. 3AgCl, 2AgCl, 1AgCl
3. 2AgCl, 3AgCl, 2AgCl
4. 1AgCl, 3AgCl, 2AgCl

Correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co3+ is

1. [Co(H2O)6]3+, [Co(en)3]3+, [Co(NH3)6]3+
2. [Co(H2O)6]3+, [Co(NH3)6]3+, [Co(en)3]3+
3. [Co(NH3)6]3+, [Co(en)3]3+, [Co(H2O)6]3+
4. [Co(en)3]3+, [Co(NH3)6]3+, [Co(H2O)6]3+

Pick out the correct statement with respect to [Mn(CN)6]3-.

1. It is sp3d2 hybridised and tetrahedral.
2. It is d2sp3 hybridised and octahedral.
3. It is dsp2 hybridised and square planar.
4. It is sp3d2 hybridised and octahedral.

Which of the following has longest C-O bond length? (Free C-O bond length in CO is 1.128 Å.)

1. [Fe(CO)4]2-
2. [Mn(CO)6]+
3. Ni(CO)4
4. [Co(CO)4]-