Organic Pollutants Quiz
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Questions and Answers

What is the most toxic dioxin among all the substances mentioned?

  • DCDD (Dichlorodibenzo[1,4]dioxin)
  • DCDE (Dichlorodibenzo[1,4]dioxin)
  • TCDD (2,3,7,8-tetrachlorodibenzo[1,4]dioxin) (correct)
  • TCDE (2,3,7,8-tetrachlorodibenzo[1,4]dioxin)

    • Which of the following is NOT one of the 12 'dirties' that caused the thinning of the ozone layer?

  • Aldrin
  • Hexachlorobenzene
  • Endrin
  • Dioxins (correct)

    • What is the primary source of contamination of food with PCBs?

  • Soil pollution
  • Air pollution
  • Water pollution
  • Open burning of PCB-containing solid waste (correct)

    • Which category of PCB usage accounted for 90% of PCB usage in the US in 1971?

    <p>Controllable Closed System</p> Signup and view all the answers

    What type of processes are involved in stationary source contamination of dioxins?

    <p>Chemical processes involving chlorine</p> Signup and view all the answers

    Which substance is commonly used as insulators or lubricants?

    <p>PCBs</p> Signup and view all the answers

    What do the first two digits in the nomenclature of PCBs represent?

    <p>% of chlorine by mass</p> Signup and view all the answers

    What causes some people in other regions to become more prone to skin cancer according to the text?

    <p>$Ozone$ layer thinning</p> Signup and view all the answers

    What is the main usage category of PCBs referred to as 'Controllable Closed System' used for?

    <p>Capacitors and transformers</p> Signup and view all the answers

    Why are dioxins or PCDDs typically synthesized as byproducts?

    <p>Accidental synthesis from burning certain materials</p> Signup and view all the answers

    What are some examples of organic pollutants mentioned in the text?

    <p>PCBs and PAHs</p> Signup and view all the answers

    How are dioxins or PCDDs typically synthesized according to the text?

    <p>By accidental synthesis as byproducts from certain processes</p> Signup and view all the answers

    What is the most toxic dioxin mentioned in the text?

    <p>TCDD</p> Signup and view all the answers

    Which process can lead to environmental contamination of PCBs?

    <p>Open burning or incomplete combustion of PCB-containing solid waste</p> Signup and view all the answers

    What are the primary sources of contamination for dioxins?

    <p>Stationary sources like chemical processes involving chlorine</p> Signup and view all the answers

    Which category of PCB usage involves small capacitors in small gadgets and lubricating fluids?

    <p>Non-controllable Closed System</p> Signup and view all the answers

    What do the first two digits in the nomenclature of PCBs represent?

    <p>The number of carbons in the phenyl rings</p> Signup and view all the answers

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