Chemistry and Society — DU B.Sc (hons) Chemistry Previous Year Question Papers

: B. Sc. (Hons)/B. Sc. (Prog.) : GE: Chemistryand society Instruction for the candidates ; Q1. (i) Which of the following element has a zero valency? (ii) How does the metallic character of elements change on moving down in the periodic table? (c) Remains the sane (d) First decreases then increases (iii) Fill the missing term, Risk = Hazard x (d) Reactivity is a green solvent as well as a greenhouse gas. (c) Carbon monoxide (d) Carbon Dioxide (v) Benzene, a dyes. substance, is used as industrial solvent in the production o.f plastics and (b) Non-flammable (vi) Name two common ingredients used in cosmetics and give their functions. (vii) How do s-Pap and detergents differ in their mode of action. (viii) What is `flame test'? What is the significance of flame test? (ix) Define metal toxicity with example. (x) What are polymers? Give two examples. (2x5) Q2. (i) What are the goals of green chemistry? Discuss the limitations in achieving these goals. (ii) What are the major pollutants of water? Discuss the ways to control water pollution? (iii) Give the synthesis of aspirin. Write its uses and side effects. Q3. (i) What are polymers? Give two common exalnples. (ii) Discuss the environmental issues associated with plastics and polymers. (iii) Describe how air pollution occur due to chemical sources. Explain with examples. Q4. (i) What do you understand by `solubility tests'? Explain giving two suitable examples. (ii) Write a short note on "zero-waste chemistry". (iii) What is a `decomposition reaction'? Give a suitable example. Q5. (i) What are the sources of air pollution? Discuss the ways to monitor air pollution. (ii) What is endothermic reaction? Explain with the help of suitable examples. (iii) What are Preservatives? Discuss their role in food preservation. Q6. (i) Define the term biomagniflcation. How does it affect various organisms? (ii) What is adulteration? Which is the common adulterant mixed with honey? Give the test to I detect its pres?,nce in the salnple. (iii) What are polymers? Discuss various uses of polymers. (5, 5, 5)