Download CHEMISTRY (HONOURS) Part

CHEMISTRY (HONOURS) Part-3
PAPER –VII
2011
1. Apply Schrodinger wave equation to a particle in one-dimensional box and
expression for the eigen function and eigenvalue of the energy.
2. (a) Outline the important postulates of quantum mechanics.
(b) Discuss and derive de Broglie equation.
3. Discuss the basic principles involved in the study of infrared
Spectroscopy. Discuss its various applications.
4. What are the selection rules for rotation-vibration Raman Spectra of diatomic
molecules? Applying these rules, explain what type of rotation –vibration
Ramam spectrum is obtained for a diatomic molecule.
5. (a) State and explain Grottius –Draper law and stark-Einstein law.
(b) Discuss the abnormally high quantum yield of the 𝐻2 +C𝑙2 = 2HCl
6. (a)What is depole moment? How is it determined?
(b)Which of the following molecules have zero of finite pipole moment and
why?
𝐻2 O, N𝐻3 , C𝑂2 , C𝑙2
7. (a) Explain the concepts of activity and activity coefficient.
(b) How is activity coefficient of an electrolyte determine by depression in freezingpoint method?
8. (a) Derive thermodynamically a relation between molecular weight of the solute
and elevation in boiling point of the solution.
(b) Calculate the boilding point of 1m aqueous solution of sodium chloride. [Kb =
0.52 K kg mo𝑙−1 ]
2009
1. (a) Show by means of a diagram how the patterns of d-orbital spliting changes as
anoctahedral complex undergoes teragonal distortion and eventually become a square planner
complex.
(b) What is epectrochemical series and what is its importance?
2. (a) What are organometallic compounds?
(b) Describe three important general methods of preparing organometallic compounds.
(c) Describe the structure and bonding of the anion [Pt𝐶𝐿3 𝐶𝐿3 CH]- in Zeise's salt.
3. (a)Write the formula of the mononuclear metal carbonyls formed by V, Cr, Fe and Ni.
(b)Explain using MO diagram how CO which has neligible doner properties towards
simple acceptors such as B𝐹3 can form strong bonds to transition metal atoms.
4. Give short account of substitution reactions in square planar complaxes including transeffect.
5. Write a note on silicones with respect to chemical nature, structure, preparation and
industrial applications.
(a)Draw the combined Orgel diagram for d1 and 𝑑 9 ions in octahedral and tetrahedral field.
(b)Why the tetrahedral complexes of an element give much more intense d-d spectra than its
octahedral complexes?
(c) Discuss laporte orbital selection rule.
6.(a)Name two non-transition and four transition metals that play important functional roles
in biological processes.
(b)Write a brief account on the functions of Na and K in
biological systems.
(c) Give a very brief account of the biological role of La.
7.(a)Discuss the hard and soft acid-base concept.
(b)Using the above concept, predict which of the following Adducts should be the more
stable adduct and then explain your choice both in terms of -𝜎 and 𝜋– bonding effects :
𝐻3 N:BB𝑅3 or 𝐹3 N:B𝐹3
2008
1. (a) Define and explain law of photochemical equivalence.
(b) Discuss the photochemical combination of H, and chlorine.
(c) Calculate the number of moles of HCL(g) produced by the absorption of one joule of radiation
energy of wavelength 480 nm in the reaction'𝐻2 (𝑔) + 𝑐𝑙2 (𝑔) = 2𝐻𝐶𝑙(𝑔) if the quantum yield of the
photochemical rk is 1.0 x 106.
2. (a) Why there is depression in freezing point when a non-volatile solute is dissolved in solvent ? Give
an experimental method for determination of depression in freeezing point.
(b) 0.001 kg of a solute dissolved in 0.1 kg of solvent gave depression in freezing point = 0.2K.
Calculate the molecular mass of the solute. Kf for water is 5.0 Kkg/mole.
(c) Why solutions of electrolyte show abnormal behaviour ? What
is VantHoffs factor ?
3. Explain the formation of electronic band spectrum on the basis of potential energy curves. How these
curves help in the determination of dissociation of energy of the molecules? Taking example of
carbonyl compoun, represent molecular orbital and explain the electronic transition taking place
between them.
4. What is Born-Oppenheimer approximation in quantum mechanics. How, is , it applied in the study of
energy curves 𝐻2+ Ions ?
5. Write Schrodinger wave equation for hydrogen like atom in spherical co-ordinates. How can you
separate the variables of the equation to get - expression containing one variable only ?
6. .Deduce clausius-Mossofti equation. Write notes on :
(a) Optical activity\
(b) Dipole moment
7. (a) Distinguish between Osmosis and Diffusion.
(b) How would you determine molecular weight from osmotic pressure measurements ?
(c) A solution containing 4g of non-volatile organic solute in 0.1 dm1 of the solution exerts and
osmotic pressure of 66.66 K Pa at 300 K. Calculate molar mass of the solute.
8. Write short notes on the following :
(a) Principles of NMR spectroscopy
(b) Hamiltorrian operator
(c) Valence bond model of 𝐻2
(d) Paramagnetism and diamagnetism