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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI 600 034
B.Sc.DEGREE EXAMINATION -CHEMISTRY
THIRD SEMESTER APRIL 2018
CH 3503/ CH 3507 MAIN GROUP ELEMENTS SOLID STATE CHEMISTRY
Date: 07-05-2018 Dept. No. Max. 100 Marks
Time: 01:00-04:00
PART A
Answer all questions (All questions carries equal Marks) 10 x 2 20 Marks
1. Write the chemical formula of the oxides formed by Group 1 metals?
2. Give the preparation of lithualuminum hydride.
3. What is borax? Write its chemical formula
4. The crystal structure of diamond is made up of tetrahedral units- True/False
ii) Graphite layer is composed of flat hexagonal rings of C atoms- True/False
5. What happens when ammonia is boiled with sodium hypochlorite in the presence of gelatin.
6. Draw the resonance structure of SO3 molecule
7. Mention any two uses of ClO2
8. How is ammonium perchlorate prepared? What is the use of this compound?
9. Diamond has a sharp melting point, whereas glass does not have a sharp melting point. Why?
10. Write the mathematical expression of Bragg's law and explain the terms in it.
PART B
Answer any Eight questions 8 x 5 40 Marks
11. Explain the anomalous behavior of Li compared to other alkali metals.
12. Explain the function of sodium-potassium pump
13. What are boron hydrides? How are they classified?
14. How do you classify carbides? Provide an example for each type.
15. How are hydrazine and hydrazoic acid prepared from ammonia
16. Draw the structures of hypophosphorus acid, and pyrophosphoric acid.
17. Explain the preparation of nitric acid by Ostwald's process.
18. How is bleaching powder prepared? Mention the oxidation state of O in OF2 and
SO2.
19. Compare the acid strength of HClO, HClO2, HClO3 and HClO4.Explain
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20. Classify the following crystals as cubic, or tetragonal or monoclinic, or
rhombic. ZnS, ii) NaCl iii) TiO2 iv) NiSO4 CaSO4
21. Write a note on stoichometric defects
22. Explain the structure of sodium chloride with neat sketch.
PART C
Answer any Four questions 4 x 10 40 Marks
23. Distinguish caustic soda from washing soda and baking soda.
Outline the method of preparation of sodium hydroxide by electrolysis
Mention the uses of organometallic compounds of Li.
24. How do you classify the silicates based on their structures? Provide suitable examples with neat sketch.
25. Discuss the preparation and properties of thionyl chloride.
Write short notes on thionic acids.
26. Mention the number of bond pairs, lone pairs, hybridization and geometry of
ClF, ClF3and ClF5 .
27. Match the following
Laughing gas H2N2O2
ii) Nitrogensesquioxide Nitrousoxide
iii) Mixture of HNO3 +HNO2 Dinitrogen trioxide
iv) Nitric anhydride Nitrogen peroxide
Hyponitrous acid Nitrogen pentoxide
What are Caro's and Marshall's Acids? Mention any one method of preparation of these acids.
28. Write a note on Weiss indices and Millers indices
The interplanar distance in a crystal used for X-ray diffraction is 2 Angstrom. The angle of incidence
of X-rays is 9ο when the first order diffraction is observed. Calculate the wavelengthand energy of
the X-ray