Guru Nanak Dev University 2007-2nd Sem B.Sc Chemistry INORGANIC (Chem-201) (-2k7) - Question Paper
2057
B.Sc. (Honours School) (Chemistry) second Semester
INORGANIC CHEMISTRY
Paper - Chem-201
Time Allowed : 3 Hours
Maximum Marks : 75
part - A
NOTE :- All ques. are compulsory. every carries 1½ Marks. (10 x 1½ = 15)
1.
(a) Differentiate ranging from ortho and para hydrogen.
(b) discuss the effect of polarization on the melting point of halides of main group elements.
(c) Inspite of the fact that lithium is an alkali metal, its halides are covalent. discuss.
(d) refer to attachment
(e) refer to attachment
(f) refer to attachment
(g) refer to attachment
(h) refer to attachment
(i) refer to attachment
(j) refer to attachment
part - B
NOTE :- Attempt any eight ques.. every ques. carries 4½ marks.
2. discuss briefly structure of boranes. 4½
3. (a) How do the properties of hydroxylamine compare with those of ammonia and hydrazine ? (3)
(b) discuss structure of calcium carbide. (1½)
4. discuss briefly the reason of the subsequent :-
(a) Inert pair effect (2½)
(b) Diagonal relationship among certain elements (2)
5. refer to attachment
6. (a) define electronic configuration of lanthanides. (3)
(b) discuss the oxidation states of XII group elements. (1½)
7. discuss briefly the structures of :-
(a) Basic beryllium acetate (2½)
(b) Chlorophyll 'a' (2)
8. explain the chemistry of silicones. (4½)
9. (a) explain the position of hydrogen in the periodic table. (2)
(b) discuss briefly lanthanide contraction. (2½)
10. (a) discuss the formation of dp-pp bonds giving suitable examples. (3)
(b) Why is doubly bonded Si-Si species unstable? (1½)
11. define the chemistry of oxides of nitrogen. (4½)
12. define briefly clatharates of Noble gases. (4½)
13. define briefly isolation and seperation of lanthanides. (4½)
part - C
NOTE :- Attempt any two ques.. every ques. carries 12 marks.
(Please refer to attachment beneath for part - C)
SECTION A
1.
(d) BF3 exists while BH3 does not exist. Explain.
(e) Aluminium forms [Al(OH)6]3- but [B(OH)6]3- is not known. Explain.
(f) Pb4+ compounds are oxidizing agents. Explain.
(g) The O-O bond energy in O2 is much larger than S-S bond energy in S8. Explain.
(h) NF5 is not known but PF5 is so well known. Explain.
(i) Why is mercury(I) ion written Hg22+ while the copper(I) ion is written Cu+ ?
(j) Work out the number of electrons in the ground state of La3+ and Ce4+ ions.
SECTION B
- Describe briefly the chemistry of H3PO4. (4)
SECTION C
14. (a) How is S4N4 prepared? Describe its structure and sketch its resonance
structures. Describe its reaction with fluorine and chlorine. (8)
(b) Discuss the classification and structure of various types of silicanes. (4)
15. Describe in detail the preparation, properties, structure and uses of the
interhalogen belonging to XY, XY3 and XY5 types. (12)
16. Discuss the preparation, properties and structure of :
(a) OF2
(b) O2F2
(c) Cl2O
(d) I2O5 (3, 3, 3, 3)
17. (a) Discuss the chemistry of phosphazenes and cyclophosphazenes. (4)
(b) Describe the preparation and properties of BeCl2 and Ba2O2. (4)
(c) Explain electropositive character of iodine with examples. (4)
| Earning: Approval pending. |
