LNMU B.SC Chemistry part 3 Question pdf free download ~ LNMU Notes

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CHEMISTRY PART  -3   2019

PAPER – 5   

                                                         

Answer any five questions in which Q.no. 1 is compulsory.

1.  Explain  any four questions of the following .

(a) Physical adsorption is exothermic.

(b) Quantum yield of photochemical combination of  H2 and C12 is very high.

(c) Dipole moment of benzene is zero.

(d) Chemical potential decreases with increase of temperature and decrease of pressure.

(e) Entropy of activation is related with pre-exponential factor of reactions.

(f) Rotational Spectra of diatomic molecules are equispaced.

   Q..2.  

(a) What are quantum mechanical operators ? Explain.

(b) Write down the time dependent Schrodinger wave equation and derive time independent Schrodinger wave equation from it .

   Q..3.  Derive the following thermodynamic equations :

       

Q..4.   Discuss collision theory of bimolecular reactions and derive expression of rate-constant. Explain the success and failure of the theory.

Q..5. 

(a) Distinguish between thermal and photochemical reactions.

(b) Describe fluorescence and phosphorescence with Jablonsky diagram.

Q..6. 

(a) Find out expression for emf of concentration cell with transference.

(b) How is L JP eliminated ? Explain.

Q..7. 

(a) Explain lr active and microactive molecules giving examples.

(b) Discuss PMR Spectra of ethanol.

Q..8.  Derive and discuss Gibb’s Adsorption Isotherm and explain surface active and inactive substance.

Q..9.

(a|) What do you mean by polarisation ? Explain.

(b) Explain induced dipole moment.

(c) Explain, why carbon-tetrachloride is non  polar?

Q..10.   Write notes on any two of the following : 

(a)  Quantum yield of photochemical reactions

(b) Electronic transition in Organic molecules

(c)  Theory of indicators.

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