CSIR NET Chemical Sciences Interdisciplinary Topics Syllabus

Interdisciplinary Topics syllabus — full chapter and topic list

Expand any chapter to see its topics and sub-topics. This is the whole examinable outline for Interdisciplinary Topics in CSIR NET Chemical Sciences, not a summary of it.

1. 1

   Environmental Chemistry

   3 topics

   • Environmental Pollutants
   • Green Chemistry
   • Toxic Chemicals in the Environment
2. 2

   Supramolecular Chemistry

   3 topics

   • Molecular Recognition
   • Self-Assembly Processes
   • Host-Guest Chemistry
3. 3

   Nanochemistry

   3 topics

   • Synthesis of Nanomaterials
   • Properties of Nanomaterials
   • Applications of Nanotechnology
4. 4

   Medicinal Chemistry

   3 topics

   • Drug Design
   • Drug Action
   • Pharmacokinetics

Interdisciplinary Topics flashcards for CSIR NET Chemical Sciences

21 of 52 cards from the Interdisciplinary Topics deck — real questions with worked answers.

1. What are the two broad categories of environmental pollutants based on their persistence and degradability?

   Biodegradable pollutants (broken down by natural processes, e.g., sewage, domestic waste) and non-biodegradable / persistent pollutants (e.g., DDT, plastics, heavy metals like Hg, Pb, As) that accumulate in the environment.

2. What is the difference between primary and secondary air pollutants? Give one example of each.

   Primary pollutants are emitted directly into the air (e.g., CO, SO2, NOx). Secondary pollutants form by reactions of primary pollutants in the atmosphere (e.g., ozone (O3), PAN, sulphuric/nitric acid in acid rain).

3. What is photochemical smog and what are its main components?

   Oxidizing smog formed by sunlight-driven reactions of NOx and volatile hydrocarbons. Main components include ozone (O3), peroxyacetyl nitrate (PAN), nitrogen oxides, and aldehydes; characteristic of warm, sunny, traffic-dense cities.

4. Which gases are the principal contributors to acid rain and what acids do they form?

   SO2 and NOx; SO2 is oxidized and forms sulphurous/sulphuric acid (H2SO3/H2SO4) and NOx forms nitric acid (HNO3), lowering rain pH below ~5.6.

5. What is BOD and what does a high BOD value indicate about water?

   Biochemical (Biological) Oxygen Demand: the amount of dissolved O2 needed by aerobic microbes to decompose organic matter in water (usually measured over 5 days at 20 C). A high BOD indicates heavy organic pollution and poor water quality.

6. Define eutrophication and name the nutrients chiefly responsible.

   Nutrient enrichment of a water body (mainly by nitrates and phosphates from fertilizers/detergents) causing algal blooms, oxygen depletion on decay, and death of aquatic life.

7. What is the Twelve Principles framework of Green Chemistry attributed to?

   Paul Anastas and John Warner (1998) — they formulated the 12 Principles of Green Chemistry to guide the design of chemical products and processes that reduce or eliminate hazardous substances.

8. State the first principle of Green Chemistry.

   Prevention — it is better to prevent waste than to treat or clean up waste after it has been created.

9. Define 'atom economy' in green chemistry and give its formula.

   A measure of how much of the reactant atoms end up in the desired product. % Atom Economy = (molecular mass of desired product / total molecular mass of all reactants) x 100. Higher is greener.

10. What is the E-factor in green chemistry?

    Environmental factor = mass of waste produced / mass of desired product. A lower E-factor indicates a greener, less wasteful process; bulk chemicals have low E-factors, fine chemicals/pharma have high ones.

11. Why are supercritical CO2 and water considered green solvents?

    They are non-toxic, non-flammable, inexpensive, and easily recoverable, replacing volatile organic solvents (VOCs). Supercritical CO2 (above 31 C, 73 atm) acts as a tunable solvent and water is benign and abundant.

12. What is meant by a 'green' catalyst preference (catalytic vs stoichiometric reagents) in green chemistry?

    Catalytic reagents (used in small amounts, regenerated) are superior to stoichiometric reagents because they minimize waste, are selective, and reduce reagent consumption per unit product.

13. What are POPs (Persistent Organic Pollutants) and name two examples?

    Toxic organic compounds resistant to degradation that bioaccumulate and undergo long-range transport. Examples: DDT, PCBs, dioxins, furans, aldrin/dieldrin (regulated by the Stockholm Convention).

14. What is biomagnification (biological magnification)?

    The progressive increase in concentration of a persistent toxicant (e.g., DDT, methylmercury) at successively higher trophic levels of a food chain.

15. Describe the toxicity mechanism of carbon monoxide (CO).

    CO binds hemoglobin ~200-250 times more strongly than O2, forming carboxyhemoglobin (COHb), which reduces oxygen-carrying capacity and causes tissue hypoxia.

16. What disease is associated with methylmercury poisoning, and what was its source?

    Minamata disease — neurological disorder caused by consumption of fish contaminated with methylmercury discharged into Minamata Bay, Japan.

17. What is itai-itai disease and which heavy metal causes it?

    A painful bone-softening (osteomalacia) and kidney disease caused by chronic cadmium (Cd) poisoning, historically from contaminated rice/water in Japan.

18. What is the toxic effect of lead (Pb) on the human body?

    Lead inhibits enzymes of heme synthesis (e.g., ALA dehydratase), causing anemia, and is a neurotoxin damaging the brain/nervous system, especially harmful to children's cognitive development.

19. Define molecular recognition.

    The specific, selective binding of a host (receptor) to a guest (substrate) through complementary non-covalent interactions and geometric/electronic complementarity.

20. List the main non-covalent interactions responsible for molecular recognition.

    Hydrogen bonding, electrostatic/ionic interactions, van der Waals forces, pi-pi stacking, hydrophobic effects, and metal-ligand coordination.

21. Differentiate the 'lock-and-key' model from the 'induced-fit' model of recognition.

    Lock-and-key (Emil Fischer): host and guest are rigidly complementary in shape. Induced-fit (Koshland): the host (or guest) changes conformation upon binding to achieve complementarity.

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