The ionization isomer of [Cr(H₂O)₄Cl(NO₂)]Cl is 

1

(a)

[Cr(H₂O)₄ (O₂N)] Cl₂

(b)

[Cr(H₂O)₄Cl₂] (NO₂)

(c)

[Cr(H₂O)₄Cl(ONO)] Cl

(d)

Cr(H₂O)₄Cl₂(NO₂)] H₂O

The primary and secondary valencies of chromium in the complex ion, dichlorodioxalatochromium (III) are respectively

1

(a)

3,4

(b)

4,3

(c)

3,6

(d)

6,3

The hybridisation of Fe in K₄[Fe(CN)₆] is 

1

(a)

dsp²

(b)

sp³

(c)

d²sp³

(d)

sp³d²

Which of the following compound has tetrahedral geometry? 

1

(a)

[Ni(CN)₄]^2-

(b)

[Pd(CN)₄]^2-

(c)

[PdCl₄]^2-

(d)

[NiCl₄]^2-

The increasing order of the crystal field splitting power of some common ligands is 

1

(a)

H₂O < OH^- < Cl^- < F^- < CN^-

(b)

CN^- < H₂O < OH^- < F^- < Cl^-

(c)

F^- < CN^- < OH^- < Cl^- < H₂O

(d)

Cl^- < F^- < OH^- < H₂O < CN^-

Give an example of ionisation isomerism.

1

(a)

[Co(NH₃)₅Br]SO₄ and [Co(NH₃)₅SO₄ )] Br is example of ionisation isomerism.

The oxidation number of cobalt in K[Co(CO)₄] is
(a) +1
(b) +3
(c) -1
(d) -3

1

(a)

-1 \(\because \) + 1 + x + 0 = 0  \(\Rightarrow \) x = -1
[oxidation number of 'K' is +1, CO is neutral ligand].

Write I.U.P.A.C name of
(i) [Co(NH₃)₅Cl] Cl₂
(ii) [Co (en)₂Cl (ONO)]⁺

1

(a)

(i) pentaamminechloridocobalt (III) chloride
(ii) chloridobis (ethane-1, 2-diamine) nitritocobalt (III) ion.

 

Write the IUPAC name of
(i) Hg[Co(CNS)₄]
(ii) K[Co(CN)(CO)₂(NO)]

1

(a)

(i) mercuric tetrathiocyanatocobaltate (II)
(ii) potassium dicarbonylcyanonitrosocobaltate (II)

Write the IUPAC name of [Ni(CN)₄]^2-  ion.

1

(a)

tetracyanonickelate (II) ion.

Name the following coordination compounds and draw their structures:
(i) [CoCl₂(en)₂]Cl
(ii) [Pt(NH₃)₂CI(NO₂)]
(At no. Co = 27, Pt = 78)

2

(a)

How is stability of coordination compounds determined in aqueous solution?

2

(a)

[Fe(H₂O)₆]³⁺ is strongly paramagnetic where as [Fe(CN)₆]^3- is weakely paramagnetic. Explain.

2

(a)

Give reason in two or three sentences only for the following:
The species [CuCl₄]^2- exists while [CuI₄]^2- does not?

2

(a)

For the complex [Fe(en)₂Cl₂]Cl, identify the following:
(i) Oxidation number of iron.
(ii) Hybrid orbitals and shape of the complex.
(iii) Magnetic behavior of the complex.
(iv) Number of its geometrical isomers.
(v) Whether there may be optical isomer also.
(vi) Name of the complex.

3

(a)

(a) What is a ligand? Give an example of a bidentate ligand.
(b) Explain as to how the two complexes of nickel. [Ni(CN)₄]^2- and  Ni(CO)₄, have different structures but do not differ in their magetic behaviour. (Atomic number of Ni = 28).

3

(a)

Draw figure to show splitting of d orbitals in an octahedral crystal field.

3

(a)

What is the relationship between observed colour of the complex and the wavelength of light absorbed by the complex ?

5

(a)

Why are different colours observed in octahedral and tetrahedral complexes for the same metal and same ligands ?

5

(a)