Question
Write a note on DDT.
✓
Answer
→ DDT, the first chlorinated organic insecticides, was originally prepared in 1873, but it was not until 1939 that Paul Muller of Geigy Pharmaceuticals in Switzerland discovered the effectiveness of DDT as an insecticide.
→ Paul Muller was awarded the Nobel Prize in Medicine and Physiology in 1948 for this discovery.
→ The use of DDT increased enormously on a worldwide basis after world war II, primarily because of its effectiveness against the mosquito that spreads malaria and lice that carry typhus.
→ However, problems related to extensive use of DDT began to appear in the late 1940s.
→ Many species of insects developed resistance to DDT, and it was also discovered to have a high toxicity towards fish.
→ The chemical stability of DDT and its fat solubility compounded the problem.
→ DDT is not metabolised very rapidly by animals; instead, it is deposited and stored in the fatty tissues.
→ If ingestion continues at a steady rate, DDT builds up within the animal over time.
→The use of DDT was banned in the United States in 1973, although it is still in use in some other parts of the world.
→ Paul Muller was awarded the Nobel Prize in Medicine and Physiology in 1948 for this discovery.
→ The use of DDT increased enormously on a worldwide basis after world war II, primarily because of its effectiveness against the mosquito that spreads malaria and lice that carry typhus.
→ However, problems related to extensive use of DDT began to appear in the late 1940s.
→ Many species of insects developed resistance to DDT, and it was also discovered to have a high toxicity towards fish.
→ The chemical stability of DDT and its fat solubility compounded the problem.
→ DDT is not metabolised very rapidly by animals; instead, it is deposited and stored in the fatty tissues.
→ If ingestion continues at a steady rate, DDT builds up within the animal over time.
→The use of DDT was banned in the United States in 1973, although it is still in use in some other parts of the world.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Explain solubility of gas in a liquid solvent.
- What type of isomerism is shown by [Co(NH3)5ONO]Cl2?
- On the basis of crystal field theory, write the electronic configuration for d4 ion if
(Atomic number of Fe = 26)
Answer the following questions:
Compare non transition and transition elements on the basis of their.
Compare non transition and transition elements on the basis of their.
- Variability of oxidation states.
- Stability of oxidation states.
The decomposition of NH3 on platinum surface,$\text{2NH}_{3}\text{(g)}\text{ }^{Pt}_\rightarrow\text{N}_{2}\text{(g)}+\text{3H}_{2}\text{(g)}$ is a zero order reaction with k$=\text{2.5}\times\text{10}^{-4}\text{Ms}^{-1}$ . what are the rates of production of N2 and H 2?
→What is galvanic cell? Give half cell reaction of Daniell cell.
- Calculate $\Delta$rGo for the reaction:
Mg (s) + Cu2+ (aq) $\rightarrow$ Mg2+ (aq) + Cu (s)
Given: Eocell = + 2.71 V, 1 F = 96500 C mol–1
- Name the type of cell which was used in Apollo space programme for providing electrical power.
Iron has a body centred unit cell with a cell edge of 286.6 pm. The density of iron is 7.87 g $ cm^{-3} $ Use these information to calculate Avogadro's number. (Atomic weight of Fe, 56 g $ mol^{-1} $)
→Calculate the mass of ascorbic acid (Vitamin C, $ C_{6}H_{8}O_{6} $) to be dissolved in 75 g of acetic acid to lower its melting point by $ 1.5^{\circ}C $. ($ K_{f} $ for $ CH_{3}COOH = 3.9 K kg mol^{-1} $)
→Explain aldol condensation with suitable example. ### Write a short note: Aldol condensation.
What are enantiomers? Draw the structures of the possible enantiomers of 3-methylpent-1-ene.