Chem-DSE-14: Industrial Chemicals and Environment — DU B. Sc. Life Science (Chemistry) Previous Year Question Papers

(iv) BOD and COD (v) Nitrification and Denitrification (b) What is meant by greenhouse effect? Give the important photochemical reactions occurring in the atmosphere. (c) Give the molecular formula and uses of bleaching powder and potassium dichromate. ` (5,5,5) 6. (a) Discuss methods used for primary treatment of wastewater in detail. (b) Name the physical, chemical, and biological parameters used to define water quality. (c) Explain the process of softening hard water. Physical Science Instructions .for Candidat_elf 15 marks each. (i) Name one chemical used for coagulation (ii) The full form of COD is (iii) The main constituent of green house gases is (iv) Reagent used in the analysis of sulphur dioxide (v) Name any one bacteria used for nitrogen fixation (b) Write short .notes : (Any two) : (i) Ozone Hole (ii) Acid Rain` (iii) Hydrosphere (c)Describe the Ostwald process for nitric acid preparation and the hazards involved in handling. (5,5,5) (a) Give one method for the manufacture of potassium dichromate and write its applications. (b) Name the physical, chemical, and biological parameters used to define water quality. (c)Discuss the different components of the lithosphere. (5,5,5) 3. Write a short note on : (Any three) (i) Particulate matter. (ii) Carbon monoxide gas analysis. (iii) pollution from the fertilizer industry. (iv) Name the different types of species present in the aquatic ecosystem and their importance. (v) Effect of sulphur dioxide and nitrogen oxides on humans. (5,5,5) 4. (a) Explain the difference between Industrial waste water and domestic waste water. (b) Describe the Chlorination and reverse osmosis techniques for the purification of water. (c) Explain the causes, effects, and control measures of water pollution. (5,5,5) 5. (a) Differentiate between : (Any three) (i) Stratosphere and thermosphere (ii) Anaerobic and aerobic digestion (iii) Biosphere and lithosphere