1. Choose the most correct option.

i. The oxidation state of cobalt ion in the complex [Co(NH3)5Br]SO4 is
a. +2

b. +3
c. +1

d. +4

ii. IUPAC name of the complex [Pt(en)2(SCN)2]2+ is
a. bis (ethylenediamine dithiocyanatoplatinum (IV) ion
b. bis (ethylenediamine) dithiocyantoplatinate (IV) ion
c. dicyanatobis (ethylenediamine) platinate IV ion
d. bis (ethylenediammine)dithiocynato platinate (IV) ion

iii. Formula for the compound sodium hexacynoferrate (III) is
a. [NaFe(CN)6]

b. Na2[Fe(CN)6]
c. Na[Fe(CN)6]

d. Na3[Fe(CN)6]

iv. Which of the following complexes exist as cis and trans isomers ?
1. [Cr(NH3)2Cl4]

2. [Co(NH3)5Br]2⊕

3. [PtCl2Br2]2 (square planar)
4. [FeCl2(NCS)2]2 (tetrahedral)
a. 1 and 3

b. 2 and 3
c. 1 and 3

d. 4 only

v. Which of the following complexes are chiral ?
1. [Co(en)2Cl2]⊕

2. [Pt(en)Cl2]
3. [Cr(C2O4)3]3

4. [Co(NH3)4Cl2]⊕
a. 1 and 3

b. 2 and 3
c. 1 and 4

d. 2 and 4

vi. On the basis of CFT predict the number of unpaired electrons in [CrF6]3 .
a. 1

b. 2

c. 3

d. 4

vii. When an excess of AgNO3 is added to the  complex one mole of AgCl is precipitated. The formula of the complex is
a. [CoCl2(NH3)4]Cl
b. [CoCl(NH3)4] Cl2

c. [CoCl3(NH3)3]
d. [Co(NH3)4]Cl3

viii. The sum of coordination number and  oxidation number of M in [M(en)2C2O4]Cl is
a. 6

b. 7

c. 9

d. 8

2. Answer the following in one or two entences.

i. Write the formula for tetraammineplatinum (II) chloride.

ii. Predict whether the [Cr(en)2(H2O)2]3+ complex is chiral. Write structure of its

iv. Name the Lewis acids and bases in the complex [PtCl2(NH3)2].

v. What is the shape of a complex in which the coordination number of central metal
ion is 4 ?

vi. Is the complex [CoF6] cationic or anionic if the oxidation state of cobalt ion is +3 ?

vii. Consider the complexes [Cu(NH3)4][PtCl4] and [Pt(NH3)4] [CuCl4]. What type of isomerism these two complexes exhibit?

viii. Mention two applications of coordination compounds.

3. Answer in brief.

i. What are bidentate ligands ? Give one example.

ii. What is the coordination number and oxidation state of metal ion in the complex [Pt(NH3)Cl5] ?

iii. What is the difference between a double salt and a complex ? Give an example.

iv. Classify following complexes as homoleptic and heteroleptic [Cu(NH3)4]SO4, [Cu(en)2(H2O)Cl]2⊕, [Fe(H2O)5(NCS)]2⊕, tetraammine zinc (II) nitrate..

v. Write formulae of the following complexes a. Potassium amminetrichloroplatinate (II) b. Dicyanoaurate (I) ion

vi. What are ionization isomers ? Give an example.

vii. What are the high-spin and low-spin complexes ?

viii. [CoCl4]2 is tetrahedral complex. Draw its box orbital diagram. State which orbitals participate in hybridization.

ix. What are strong field and weak field ligands ? Give one example of each.

x. With the help of crystal field energylevel diagram explain why the complex [Cr(en)3]3⊕ is coloured ?

4. Answer the following questions.

i. Give valence bond description for the bonding in the complex [VCl4] . Draw box diagrams for free metal ion. Which hybrid orbitals are used by the metal ?
State the number of unpaired electrons.

ii. Draw qualitatively energy-level diagram showing d-orbital splitting in the octahedral environment. Predict the number of unpaired electrons in the complex [Fe(CN)6]4 . Is the complex diamagnetic or paramagnetic? Is it coloured? Explain.

iii. Draw isomers in each of the following
a. [Pt(NH3)2ClNO2]
b. [Ru(NH3)4Cl2]
c. [Cr(en2)Br2]⊕

iv. Draw geometric isomers and enantiomers of the following complexes.
a. [Pt(en)3]4⊕ b. [Pt(en)2ClBr]2⊕

v. What are ligands ? What are their types ? Give one example of each type

vi. What are cationic, anionic and neutral complexes? Give one example of each.

vii. How stability of the coordination compounds can be explained in terms of
equilibrium constants ?

viii. Name the factors governing the equilibrium constants of the coordination compounds.