Fundamentals of Solid-State and Materials Chemistry — DU B.Sc (hons) Chemistry Previous Year Question Papers

DSE -Fundamentals of Solid State and Materials 2. Attempt FOUR question in all. Q1. Give reasons why @o any 5): (a) Cubic Symmetry exhibits higher symmetry than triclinic systems. a) PXRD is called a fingerprint technique. (c) Nacl adopts 6:6 coordination and Cscl adopts 8:8. (d) Some vibrational modes are IR inactive. (e) Diffraction occurs only at specific angles. ® Peak broadening occurs in nanocrystalline materials. Q2. (a) What is Bragg's Law? Explain all the terms involved in it. {b) Differentiate between solid state reaction and wet chemical synthesis routes for synthesis of nanomaterials. (c) How can you distinguish between paramagnetic, ferromagnetic, fen.;magnetic and antiferromagnetic materials? (5,5,5) Q3. (a) Discuss IR spectroscopy: principle, molecular vibrations and applications. (c) Expla.in powder x-Ray Diffraction with instrumentation and applications. (5,5,5) Q4. (a) Explain SEM and TEM with working principles and applications. Compare both (b) Discuss the advantages and disadvantages of the Top down and Bottom up approach to prepare different kinds of nanomaterials ? (c) Discuss the deshielding and shielding in Nuclear Magne.tic Resonance a"R) (aj Explain t.ne role of characterization techniques for bulk materials. (b) What are themal methods of analysis? Briefly discuss the various classification of thermal methods of analysis. (c ) (i) Define chromophore and Auxochrome with suitable examples. (ii) Explain Wimamson-Hall method to determine lattice strains from diffraction patterns. Q6. Write short notes (any three): (ii) Single Crystal X-ray Diffraction (iii) Band theory of solids (iv) Atomic Force Microscopy (AFM) (5,5,5)