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2 C 22062
Section B (Paragraph)

Answer at least five questions.

Each question carries 5 marks.

All questions can be attended.
Overall Ceiling 25.

Derive the time independent Schrodinger wave equation.

Deduce the expression for energy of an electron in n‘ orbit. Calculate the energy of electron in
hydrogen atom in ground state.

Write the postulates of quantum mechanics.
What is valence bond theory ? Explain with an example.
Explain why hydrogen forms diatomic molecule while helium remains monoatomic.
Illustrate the hybridization and geometry of PCI, and IF..
Explain the experiment which led to the discovery of spin of electrons.
(5 x 5 = 25 marks)
Section C (Essay)

Answer any one question.
The question carries 11 marks.

Explain Bohr theory of atom model. Derive the expression for Bohr radius. What are the
shortcomings of Bohr theory ?

What is meant by bonding and antibonding molecular orbitals ? How are they formed ? Illustrate
the concept on the basis of hydrogen molecule ion H,*.

(1 x 11 =11 marks)

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