The Question is from neet-chemistry environmental-chemistry , and it was created by the author Mr. S M HUSSAIN

Question

Which of the following persistent organic pollutants (POPs) is NOT correctly matched with its primary source?

Mr. S M HUSSAIN · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Persistent Organic Pollutants (POPs) and their sources
 **Related Topics**: Environmental chemistry, toxicology
 **Prerequisites**: Basic understanding of POPs and their environmental impact.
## SOLUTION PATHWAY
**Given Information**:
  Options listing POPs and their purported primary sources.
  The question asks to identify the incorrect pairing.
**Method & Steps**:
 1. Analyze each option to determine the accuracy of the source.
  Reasoning:  We need to assess the primary source of each POP listed.
  Formula/Rule: N/A
 2. Identify the option with the incorrect source-pollutant pairing.
  Working: Let's examine each option:
   a) DDT is indeed primarily used as an insecticide.
   b) PCBs were extensively used in electrical transformers and capacitors.
   c) While volcanic eruptions can release *some* dioxins, they are not the primary source.  The primary sources of dioxins are incomplete combustion processes (e.g., incineration, forest fires). 
   d) PFAS are found in firefighting foam.
 3. Determine the incorrect pairing.
  Result: Option C (Dioxins: Volcanic eruptions) is incorrect.
  Verification: Researching the primary sources of dioxins confirms that volcanic eruptions are a minor, not primary, source.
 ## OPTION ANALYSIS
A ✓: DDT is correctly paired with its primary source (insecticide).
B :x: PCBs are correctly paired with their primary source (electrical transformers).
C :x: Dioxins are incorrectly paired. Volcanic eruptions are a minor source compared to combustion processes.
D :x: PFAS are correctly paired with their primary source (firefighting foam).
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Assuming that any source that releases a POP is its primary source.  Focus on the dominant source.
  2.Confusing the various sources of POPs; knowing the main sources for each POP is key.
 **Quick Tips**:
  1.Memorize the primary sources of the most common POPs (DDT, PCBs, Dioxins, PFAS).
  2.Consider the industrial and chemical processes that would most likely produce each POP.

Mr. S M HUSSAIN · Answer

DDT: Insecticide

Mr. S M HUSSAIN · Answer

PCBs: Electrical transformers

Mr. S M HUSSAIN · Answer

The correct Option is "Dioxins: Volcanic eruptions"

Mr. S M HUSSAIN · Answer

PFAS: Firefighting foam

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