Problem 6 - A Complete Resource Book in Chemistry for JEE Main

Question

DDT is (a) a non degradable pollutant (b) a fertilizer (c) an antibiotic (d) dichloro difluoro titanium

Step-by-Step Solution

Answer

(a) a non-degradable pollutant

Step 1: Understanding the terms

Review the provided options: (a) non-degradable pollutant, (b) fertilizer, (c) antibiotic, and (d) dichloro difluoro titanium. Clarify each term to understand its relevance to DDT.

Step 2: Evaluating DDT

DDT stands for dichloro-diphenyl-trichloroethane. It is a chemical compound known for its use as a pesticide. It is not easily broken down in the environment, classifying it as a non-degradable pollutant.

Step 3: Matching options to DDT characteristics

Based on the definition from Step 2, evaluate the options: DDT is related to option (a)—a non-degradable pollutant, as it is a persistent organic pollutant and not a fertilizer, antibiotic, or related to titanium.

Key Concepts

Non-degradable Pollutant

Non-degradable pollutants are substances that do not break down easily in the environment. Unlike biodegradable pollutants, which decompose naturally over time, non-degradable pollutants persist in the ecosystem for extended periods.

These substances can accumulate, leading to environmental and health problems. Some examples include certain plastics, heavy metals like lead and mercury, and chemicals such as DDT.

DDT is a classic example of a non-degradable pollutant. It does not break down quickly due to its stable chemical structure, allowing it to remain in the environment and accumulate in the food chain.

Pesticide

Pesticides are chemical substances used to kill or control pests that threaten agricultural crops and human health. They play an important role in agriculture by increasing crop yield and ensuring food safety.

• Pesticides can target insects, weeds, fungi, and other pests.
• They come in various forms, including liquids, granules, and sprays.

One well-known pesticide is DDT (dichloro-diphenyl-trichloroethane), which was widely used in the mid-20th century to control mosquito populations and reduce malaria.

However, due to its environmental persistence and harmful effects on wildlife, its use is now banned or restricted in many countries.

Persistent Organic Pollutants

Persistent organic pollutants (POPs) are organic compounds that resist degradation and persist in the environment for a long time. POPs like DDT are known for their ability to accumulate in the fatty tissues of living organisms, leading to bioaccumulation up the food chain.

These pollutants can travel long distances through the atmosphere and water, affecting remote regions far from the original source of pollution.

• Characteristics of POPs include low water solubility and high lipid solubility.
• They are often toxic, which raises concerns about their impact on human health and the environment.
• Efforts are being made globally to manage and reduce the presence of POPs, including international agreements like the Stockholm Convention.

Understanding the persistence and impact of these pollutants is crucial for developing strategies to protect ecosystems and public health.