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[QUOTE=Brightlin;316036][B][U]Name of the University [/U][/B]: Netaji Subhas Open University
[B][U]Name of the Exam [/U][/B]: BDP Term End Exam
[B][U]Document Type [/U][/B]: Sample Question Paper
[B][U]Year[/U][/B]: 2016
[B][U]Subject[/U][/B]: Chemistry

[B][U]Website [/U][/B]: [URL]http://www.wbnsou.ac.in/student_zone/e-resources/question_bank/bdp/chemistry/Dec2015-June2016/chemistry_Dec2015-June2016.shtml#chemistry_Dec2015-June2016[/URL]
[B][U]Download Model/Sample Question Papers[/U][/B]:
[B][U]ECH - 01 [/U][/B]: [url]http://www.indianjobtalks.com/uploads/76272-ECH-01.pdf[/url]
[B][U]ECH - 02 [/U][/B]: [url]http://www.indianjobtalks.com/uploads/76272-ECH-02.pdf[/url]
[B][U]ECH - 03 [/U][/B]: [url]http://www.indianjobtalks.com/uploads/76272-ECH-03.pdf[/url]
[B][U]ECH - 05 [/U][/B]: [url]http://www.indianjobtalks.com/uploads/76272-ECH-05.pdf[/url]
[B][U]ECH - 06 [/U][/B]: [url]http://www.indianjobtalks.com/uploads/76272-ECH-06.pdf[/url]
[B][U]ECH - 07 [/U][/B]: [url]http://www.indianjobtalks.com/uploads/76272-ECH-07.pdf[/url]
[B][U]ECH - 09 [/U][/B]: [url]http://www.indianjobtalks.com/uploads/76272-ECH-09.pdf[/url]
[B][U]ECH - 10 [/U][/B]: [url]http://www.indianjobtalks.com/uploads/76272-ECH-10.pdf[/url]

[B][U]BDP Term End Chemistry Question Paper [/U][/B]:
[B][U]1st Paper [/U][/B]: General Chemistry
[B][U]Time [/U][/B]: 2 hours
[B][U]Full Marks [/U][/B]: 50

[B][U]Group-A [/U][/B]:
[U][B] Answer any two questions. 10 × 2 = 20[/B][/U]
1. (a) What is the significance of the term 'orbital magnetic quantum number' ? Draw the vector orientation of 1 ml values corresponding to l = 2 in magnetic field ( Terms have their usual significance. )
(b) Write down the main observations of the photoelectric effect. Explain these from Einstein's theory. 
(c) Why is it not possible to express the physical properties from the wave function corresponding to a particle ? 4 + 5 + 1

2. (a) The mass of a nucleus of an atom is always less than the total mass of free protons and neutrons necessary to form the nucleus. Why ?
(b) What do you mean by moderator nuclei ? State the characteristics of a good moderator nucleus.
(c) What is meant by radioactive equilibrium ? Explain. "The  concentration of member elements of a radioactive series in radioactive equilibrium becomes static." Is the statement true or false ? Justify your answer.
(d) Justify as to whether the following equations are related to light as wave motion or as a stream of particles or both ?

3. (a) Two hydrogen atoms A and B are assigned with wave functions ! " A and  ! "B respectively. Electron (1) and electron (2) are related to atoms A and B respectively. Describe the bond formation between A and B atoms in the light of VB theory.
(b) What is Hamiltonian operator ? The value of which physical quantity can be obtained with the help of it. 
(c) How many radial and angular nodes are present in 4d orbital ? 6 + 3 + 1

4. (a) Find the radius of the first orbit of Be !3+ ion and velocity of electron in this orbit.
(b) Calculate the fission energy for the following process
(c) What is meant by 'partial ionic character' of a covalent bond ? What are its consequences ? 4 + 3 + 3

[B][U]Group - B [/U][/B]:
[U][B] Answer any three questions. 6 × 3 = 18 [/B][/U]
5. (a) Prove that the density of an element does not depend on the nature of the element.
(b) What do you mean by 'Fissile Nucleus' ? Write names of two such nuclei with their atomic and mass numbers

6. Define crystal lattice. What do you understand by saying "Lattice energy of NaCl is 778 kJ/mole" ? Write down Born- Lande equation for NaCl type lattice. Explain the terms used in the equation.
7. Construct the M.O. diagram of Carbon monoxide molecule and hence comment on which end of the molecule be more basic — state and explain.

8. Define formal charge. Draw the Lewis structure of carbonate ion and calculate the formal charge on each of them. 6
9. Classify the weak chemical bonding. Discuss in brief, each type of this bonding with examples.[/QUOTE]

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