Novel Inorganic Solids — DU B.Sc (hons) Chemistry Previous Year Question Papers

(c) What are bionanocomposites ? Explain their composition and important characteristics. 7. (a) Explain the role of the Michelson interferometer in FTIR spectroscopy and how FTIR helps in identifying metal-oxygen (M-O) bonds in inorganic solids. 5 (b) Discuss the intercalation process in inorganic solids and explain its effect on properties using hydrogen-intercalated WO3 (c) Egyptian blue (CaCuSi4O10), is pale blue, and the spinel CuAl2O4 is an intense blue-green, Explain the difference. 5 8. (a) Explain any one method used for the synthesis of inorganic solids, highlighting the steps and recons involved. 5 (b) Write a short note on Inorganic phosphors. (c) What are Solid Oxide Fuel Cells (SOFCs) ? Explain their working principle. 5 Elective : Novel Inorganic 1. (a) Explain the sol-gel process used for the synthesis of inorganic solids from alkoxides, emphasizing the chemical reactions involved at each stage. 5 (b) Explain why titanium dioxide (TiO2) is preferred over other materials as a white pigment, giving suitable reasons. 5 (c) Define refractory materials and discuss their importance and industrial applications with suitable examples. 5 2. (a) What are topotactic & Epitactic reactions ? Explain th e form ation of M gAl2O4 spinel on the surfaces of MgO and Al2O3 with reactions. 5 (b) What are liquid crystals ? Explain its different types with suitable examples. 5 (c) What are matrix materials ? Explain their role in composite materials. 5 3. (a) Differentiate between pigments and dyes, and explain the essential characteristics required for an ideal inorganic pigment. 5 (b) What are single-molecule magnets (SMMs) ? Provide suitable examples, and explain the origin of their magnetic properties. 5 (c) What are ion-exchange ? Discuss their types and explain how ion exchange occurs. 5 4. (a) Discuss the conduction mechanism of conducting polymer : polyaniline or polypyrrole. 5 (b) What are solid electrolytes ? Explain how mixed solid electrolytes differ in behavior from purely cationic or anionic systems. 5 5. (a) What are Polymer blends and copolymers ? Give their classification with examples. 5 (b) Compare Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM)in terms of their principles and applications in the characterization of inorganic solids. 5 (c) What is the full form NASICON ? Explain how the crystal structure of zirconia (ZrO2) contributes to its behavior as a solid electrolyte. 5 6. (a) What is the co-precipitation method ? Describe its principle and the steps involved in the synthesis of inorganic materials. 5 (b) Discuss the different types of electronic transitions that can give rise to multiple peaks in the visible region of an inorganic solid. 5