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BCHCT 131 Solved Assignment 2020-21 in English Medium

Atomic Structure, Bonding, General Organic Chemistry and Aliphatic Hydrocarbons

Course Code: BCHCT-131
Maximum Marks: 100


Note: Attempt all questions. The marks for each question are indicated against it.


PART-(A) (50)

1. What are the postulates of Bohr model of atom? Why was this model proposed by Bohr? (5)
2. What are matter waves? Explain in phase and out of phase waves using suitable diagrams. (5)
3. What are observables? Give the operators and operation for the following observables: (5)
(i) Position (x)
(ii) Momentum (P)
(iii) Potential Energy U(x)
(iv) Total Energy (E)
4. How are spherical polar coordinates related to the rectangular cartesian coordinates? Illustrate giving suitable relations. Also write the Schrodinger equation for hydrogen atom in spherical polar coordinates. (5)
5. State and illustrate Hund’s rule and Pauli exclusion principle giving suitable examples. (5)
6. Derive the expression for the total energy of an electron in the nth orbit. (5)
7. (a) The first ionisation energies of silicon and sulphur are lower than that of phosphorus. Explain.
(b) Explain the use of cation to anion radius ratio.
(c) Arrange the following according to the increasing order of covalence: NaF, NaCl, NaBr, NaI (5)
8. For the phosphite ion, (PO3)3- :
(a) giving all the steps, write the Lewis structure.
(b) calculate the formal charges on O atoms and P atom.
(c) draw the shape of the ion.(5)
9. Explain valence bond structures of carbon monoxide molecule. (5)
10. Draw the molecular orbitals formed by the s – s combination of atomic orbitals. Also illustrate the electron densities for these orbitals and explain them. (5)

BCHCT 131 Solved Assignment 2020-21 in English Medium

PART-(B)  : (50)

11. What is structural isomerism? Explain its various types giving suitable examples. (5)
12. What are racemic mixtures? Discuss their resolution involving the formation of diastereomers. (5)

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