B.Sc. (Hons.) Chemistry IV (Fourth) Semester Examination 2014-15
Course Code: BAS408 Paper ID: 0984420
Inorganic Chemistry
Time: 3 Hours Max. Marks: 70 Max Marks: 75
Note: Attempt six questions in all. Q. No. 1 is compulsory.
1. Attempt any five of the following (limit your answer to 50 words). (4x5=20)
a) What is lanthanide contraction? Also explain the cause of it.
b) Describe the difference between inner orbital and outer orbital complexes.
c) Why do square planer complexes not show optical isomerism?
d) [Fe(CN)6)]-4 is dia magnetic but [Fe(CN)6)]-3 is paramagnetic explain it.
e) Give the IUPAC name of the following compounds.
i) [Co(en)3]Cl3 ii) K3[Co(No2)6]
iii) [Ag(NH3)2]Cl
f) First ionization energies of 5d elements are higher than those of the 3d and 4d elements. Give reasons.
g) Why do the 4d and 5d block element resembles each other more closely then they resemble the 3d block elements?
h) Write van-Arkel process for the extraction of titanium.
2. Write the following characteristics of actinides: (3+3+4)
a) Oxidation state
b) Colour
c) Magnetic properties
3. Give an account of Werner’s theory of coordination compounds. Explain it with experimental verification. What further improvement did Sidgwick make in it? (10)
4. What are chelates? Classify them by giving examples and describe their uses. (10)
5. Explain: (5+5)
a) The spectrum of [Ti(H2O)6]+3 in terms of John Teller effect
b) Crystal field stabilization energy with suitable example
6. How do the following properties vary in the first transition series? (10)
a) Stability of the various oxidation state
b) Stability to form complex
c) Colour
7. What are lanthanides? Why are they grouped together? Describe two important methods for the separation of lanthanides. (10)
8. Write the names of the ores of Mn. How it is extracted from their important ore? Write its maximum stable oxidation state and also write oxidation characters of KmnO4 in different medium. (10)