Chemistry of d- and f- block elements, Advanced Organic Spectroscopy and Quantum Chemistry — DU Physical Science courses pertaining to Chemistry Previous Year Question Papers

(iii) Using Molecular Orbital theory, construct the total wave function for H2 molecule. What does each term represent? (5) Spectroscopy and Elements of Quantum Chemistry 2. There are three sections in this paper; Section A: Inorganic Chemistry, Section 8: Organic Chemistry and Section C: Physical Chemistry. 4. Use separate answer-sheets for each section. Section A: Inorganic Chemistry 1. Describe the following with suitable examples : (a) Catalytic properties of d block elements (b) Magnetic properties of lanthanides. (c) Frost diagram (5,5,5) 2. (a) Givenbelow is theLatimer diagram forFe in acidic medium -: Answer the following questions : (i) Is there any tendency of Fe2+ to reduce to Fe? Give reasons. (ii) Write half reaction for the conversion of 3. (i) A diatomic molecule AB undergoes vibrational motion according to the harmonic oscillator model. Write the mathematical t., expression for the Hamiltonian, Schr6dinger equation and the vibrational energy expression for this system. What will be the zero point energy? (5) (ii) Show that dy = fisinc=) is an eigen function to the kinetic energy operator h2@2 i = -=;;;a and hence determine the value of kinetic energy. (5) (iii) Is there any state which undergoes disproportionation? Explain (iv) Calculate E° for Fe3+/Fe change. (v) Why is Fe042- a strong oxidizing agent? (b) Give their configuration and predict which of the following will be coloured i.n aqueous solution? (c) What are lanthanides? Explain lanthanide contraction and its consequences. (5,5,5) 3. (a) Why do some lanthanides exhibit unusual oxidation states. Explain. (iii) Determine whether operators A^ and 8 commute if : (5) (b) Discuss the tendency of transition elements to form complex compounds. (c) Distinguish between transition elements and inner transition elements for any five properties. Section 8: Organic Chemistry 1. (a) Elucidate the structure of organic compound with molecular formula C6H5NC12, the NMR spectrum of the compound is shown below. The normal carbon -13 and DEPT experiment result are tabulated. The infrared spectrum shows peaks at 3432 and 3313 cm-1 and a series of medium sized peaks between 1618 and 1466 cm-I. (10) Not.mat Carbon -13 118 Positive Positive 119.5 No Peak No Peak 128 Positive Positive 140 No Peak No Peak (iii) Draw the radial wave function plots and the radial distribution function plots for the electron in 2s and 2p orbitals of the hydrogen atom. Determine the number of radial nodes in each 2. (i) Why is n = 0 not permitted for a particle in a one-dimensional box, whereas v = 0 is permitted for a diatomic molecule undergoing harmonic oscillations? (5) (ii) Define well-behaved wave functions. State whether the following functions are. well-behaved or not. Give reason for your answer. (b) Write short note on any two of the following : (i) NOB signal enhancement (ii) Nitrogen rule in Mass Spectrometry (iii) Rule of 13 in Mass Spectrometry Section C: Physical Chemistry