Water Pollutants: Understanding Lead
The correct answer among the choices provided is Lead.
1. Why Lead is a Pollutant
Lead is a toxic heavy metal that does not belong in drinking water. It typically enters the water supply through:
Corroded Pipes: Old plumbing made of lead or brass.
Industrial Waste: Discharge from factories or mining operations.
Solder: Metal used to join copper pipes in older homes.
2. Comparison with Other Options
To understand why the other choices are generally not considered "pollutants" in this context:
Oxygen ($O_2$): Essential for the survival of fish and aquatic plants.
Nitrogen Gas ($N_2$): A harmless gas that makes up most of our atmosphere; it is naturally present in water.
Carbon Dioxide ($CO_2$): While high levels can affect water acidity ($pH$), it is a naturally occurring gas rather than a toxic contaminant.
3. Common Types of Water Pollutants
| Type | Examples |
|---|---|
| Heavy Metals | Lead, Mercury, Arsenic |
| Pathogens | Bacteria ($E. coli$), Viruses |
| Chemicals | Pesticides, Detergents, Fertilizers |
| Physical | Microplastics, Silt, Soil |
4. Health Impacts of Lead
Lead is a neurotoxin, meaning it affects the brain and nervous system. It is particularly dangerous because it is:
Persistent: It stays in the body for a long time.
Invisible: It has no smell, taste, or color when dissolved in water.
Harmful: It can cause developmental delays in children and kidney issues in adults.
Important Questions from Environmental pollution
Which one of the following is a major environmental issue in eastern Canada?
One of the main causes of air pollution in cities is emissions from vehicles like cars and trucks. Cars emit various pollutants which are bad for human health when inhaled, like
1) Nitrogen oxides (NO x)
2) Carbon monoxide (CO)
3) Carbon dioxide (CO 2)
4) Benzene
Which of the above pollutants are not tolerated by human beings even at very low levels?Which of the following substances are harmful for health if present in food items?
1) Pesticide residues
2) Lead
3) Metanil yellow
4) Mercury
Select the correct answer using the code given below:
Which of the commonly used household item(s) release Bisphenol A (BPA) which is an endocrine disruptor and bad for human health?
1. Steel utensils
2. Plastic coffee mugs
3. Aluminium utensils
4. Plastic water storage bottles
Select the correct answer using the code given below:Which one of the following is a cause of acid rains?
