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Posted Date: 13 Sep 2008 Posted By: Shafi Member Level: Gold
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2007 Tamil Nadu State QUARTERLY EXAMINATION Question paper
CHEMISTRY
UNIT TEST-I,II Marks:50
SARASWATHI MATRIC HIGHER SECONDARY EXAM STD:XII
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I. ANSWER THE FOLLOWING: 2 * 10= 20
1. Define Bond Order.
2. Define Ionisation energy.
3. Calculate the effective nuclear charge of Na atom.
4. Find out the hybridization of the following.
i )SO42- ii)H2O iii)BF3
5. State Heisenberg uncertainty principle.
6. Write intramolecular H-bonding with example.
7. Draw the shapes of p and d orbitals?
8. Explain about negative electron energy.
9. Why Be has more ionization energy Boron?
10. Write any three uses of H-bonding?
II. ANSWER ANY THREE OF THE FOLLOWING: 3 * 5= 15
11. Derive De-Broglie’s Equation?
12. Discuss about the formation of N2 molecule by M.O.T.
13. What are the factors affecting ionization energy?
14. Describe shapes of s,p,d,f orbitals .
III. ANSWER ALL THE QUESTIONS: 2 * 10=20
15. i) Explain the wave nature of electron and negative electron energy for H-atom.
ii) Explain Molecular Orbital Theory.
16. i) How will you calculate atomic radii from covalent radius.
ii) Explain Pauling method to determine ionic radii.
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