Question

Which of the following is non-degradable?

• A. CO\textsubscript{2}
• B. DDT
• C. O\textsubscript{3}
• D. SO\textsubscript{2}

Hint:

DDT is persistent in the environment, causing bioaccumulation and ecological harm, unlike naturally occurring gases like CO\textsubscript{2}, O\textsubscript{3}, and SO\textsub{2}.

Answer 1

The Correct Option is B

The question is asking us to identify which substance among the given options is non-degradable. Non-degradable substances are those that do not easily decompose in the environment, persisting for long periods and potentially causing negative impacts.

Let's analyze each option:

1. CO₂ (Carbon Dioxide): CO₂ is a naturally occurring gas in the atmosphere and is part of the carbon cycle. It is used by plants for photosynthesis and can be absorbed by the oceans. Hence, it is a degradable substance.
2. DDT (Dichloro-Diphenyl-Trichloroethane): DDT is a synthetic chemical compound that was widely used as a pesticide. It is known for its environmental persistence and bioaccumulation in food chains. DDT is non-degradable and can remain in the environment for many years. Over time, it has been banned or restricted in many countries due to its adverse environmental effects.
3. O₃ (Ozone): Ozone is a reactive gas found both at the Earth's surface and in the stratosphere. While it can be harmful at ground level, it is part of the natural atmospheric processes and eventually decomposes, making it degradable.
4. SO₂ (Sulfur Dioxide): SO₂ is a gas that can be released from volcanic eruptions and industrial processes. It can be broken down in the atmosphere and can form acid rain, indicating that it is degradable.

Based on the analysis above, DDT is the non-degradable substance among the options given. It persists in the environment and does not readily break down, leading to prolonged environmental and health impacts.

Conclusion: The correct answer is DDT.