Problem 18 - A Complete Resource Book in Chemistry for JEE Main

Question

Which one of the following is an invaluable source of energy but does not cause pollution? (a) fossil fuels (b) nuclear energy (c) sun (d) petroleum.

Step-by-Step Solution

Answer

The sun is the source of energy that does not cause pollution.

Step 1: Understanding the Options

We are given four different sources of energy: fossil fuels, nuclear energy, the sun, and petroleum. Each has different environmental impacts.

Step 2: Assessing Pollution

Fossil fuels and petroleum release carbon dioxide and other pollutants when burned. Nuclear energy produces radioactive waste, which can be hazardous.

Step 3: Identifying Clean Energy

The sun is a renewable energy source that does not produce pollutants or harmful waste during its use as an energy source.

Step 4: Conclusion

Among the given options, sunlight is the only source that provides energy without causing pollution.

Key Concepts

Environmental Impact

Every energy source affects the environment in some way. Fossil fuels, such as coal and oil, are notorious for releasing carbon dioxide and other greenhouse gases when burned. This contributes significantly to global warming and air pollution, leading to adverse health effects and environmental issues. Moreover, the extraction processes for fossil fuels, like mining and drilling, disturb natural habitats, endanger wildlife, and can cause water and land pollution.

Nuclear energy, on the other hand, doesn't release carbon emissions during electricity generation. However, it produces radioactive waste, which can remain hazardous for thousands of years. Proper disposal and management of this waste is crucial to minimize its environmental risks. Nuclear plants also require significant water resources, sometimes impacting local ecosystems.

• Fossil Fuels: Major contributors to air pollution and global warming.
• Nuclear Energy: Produces hazardous radioactive waste.

Renewable energy sources, such as wind, solar, and hydroelectric power, offer alternatives with lower environmental impacts. They rely on natural processes and cycles, reducing the release of pollutants and generally having a smaller ecological footprint.

Pollution-Free Energy

Pollution-free energy is energy generated in ways that do not harm the environment and does not produce pollutants. The concept focuses on harnessing natural energy sources, such as sunlight, wind, and hydropower, which are abundant and largely untapped.

Solar energy is especially notable because it uses the sun's rays to generate electricity without producing carbon emissions or hazardous by-products. Solar panels capture sunlight and convert it into power, which can be used to supply homes, businesses, and even power grids. Besides, solar energy systems can be deployed on a small or large scale, from rooftop panels to vast solar farms.

• Solar Energy: Renewable and broadly available without pollution.
• Wind and Hydropower: Also key sources of clean energy generation.

Using pollution-free energy sources is crucial for a sustainable future, as it reduces reliance on fossil fuels and helps combat climate change.

Energy Sources

Energy sources can be broadly categorized into renewable and non-renewable resources. Non-renewable energy sources include fossil fuels like coal, oil, and natural gas. These resources are finite and take millions of years to form. Their consumption leads to significant environmental damage and is one of the largest sources of global CO2 emissions.

Renewable energy sources, such as solar, wind, and hydropower, are constantly replenished by natural processes. They are often termed as clean or green energy sources because they offer sustainable ways to generate power without depleting the earth's resources or producing harmful emissions. Technologies like solar panels and wind turbines harness these natural forces and convert them into usable electrical power.

• Non-Renewable: Derived from natural resources that will run out over time, leading to major environmental issues.
• Renewable: Inexhaustible and environmentally friendly, promoting energy security and sustainability.

Transitioning to renewable energy is essential to reduce ecological harm and ensure a greener future for the coming generations.