Problem 17 - A Complete Resource Book in Chemistry for JEE Main

Question

Minamata disease is caused due to the presence of \(\ldots \ldots\) in water. (a) \(\mathrm{Hg}\) (b) \(\mathrm{Pb}\) (c) \(\mathrm{Cd}\) (d) As

Step-by-Step Solution

Answer

Minamata disease is caused by mercury (Hg) in water.

Step 1: Understand the Question

The question is asking for the primary cause of Minamata disease, which is a specific environmental health issue associated with water pollution.

Step 2: Recognize Minamata Disease

Review what Minamata disease is: It is a neurological syndrome caused by severe mercury poisoning.

Step 3: Analyze the Options

Look at each of the chemical symbols provided: - Hg is Mercury - Pb is Lead - Cd is Cadmium - As is Arsenic

Step 4: Choose Correct Answer

Since Minamata disease is caused by mercury poisoning, the correct answer is (a) \( \mathrm{Hg} \). Mercury (Hg), when present in high levels in water, leads to Minamata disease.

Key Concepts

Environmental Pollution

Environmental pollution refers to the introduction of harmful substances into our planet's natural environments, affecting air, water, and soil. It often results from industrial and agricultural processes, the use of motor vehicles, and waste disposal. These activities increase the levels of pollutants in the environment which can drastically affect ecosystems and human health.

Pollution can take many forms, including the release of toxic chemicals, excessive noise, and heat. Among these, chemical pollutants are particularly destructive as they often persist in nature over long periods, posing a sustained threat to life.

The devastating impacts of environmental pollution on the ecosystem and human populations underscore the urgent need for sustainable practices and effective regulations to minimize this threat.

Mercury Poisoning

Mercury poisoning occurs when an individual is exposed to high levels of mercury, a heavy metal that poses serious health risks. This poisoning can occur due to occupational exposure, as well as from consuming contaminated food and water.

There are different forms of mercury, including elemental mercury, inorganic mercury compounds, and organic mercury compounds such as methylmercury. Methylmercury, in particular, is incredibly toxic and the principal culprit in cases of mercury poisoning from environmental sources.

Consuming fish and seafood from contaminated waters is a common way people can ingest dangerous doses of methylmercury. Protecting communities requires monitoring and managing mercury levels in food and water sources, as well as raising public awareness about potential exposure risks.

Neurological Syndrome

A neurological syndrome refers to a disorder that affects the nervous system, which is responsible for processing sensory information and controlling body movements. Minamata disease is a classic example of a neurological syndrome caused by chronic mercury exposure.

This condition can lead to devastating symptoms, such as numbness in the limbs, hearing and vision loss, and severe muscle coordination problems. In more extreme cases, individuals might experience paralysis and even death.

Recognizing the signs and offering timely medical intervention is crucial to manage and mitigate the damage caused by neurological syndromes. It further highlights the importance of preventing environmental exposure to harmful pollutants like mercury.

Water Contamination

Water contamination happens when harmful substances, such as chemicals, microorganisms, or heavy metals, enter water bodies like lakes, rivers, and oceans, making the water unsafe for human consumption and aquatic life. It significantly contributes to health risks and environmental degradation.

The Minamata disaster is a well-known instance of water contamination, where industrial discharge of methylmercury into a bay led to widespread mercury poisoning among local residents. This highlighted the grave consequences of unchecked industrial pollution on water sources.

Ensuring clean and safe water requires comprehensive efforts to monitor pollution sources, enforce environmental regulations, and adopt sustainable industrial practices. Public awareness and community involvement also play key roles in safeguarding water quality.