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Question 1: Why does rain water have a pH of about 5 – 6?
Solution: Normally rain has a pH of about 5 – 6 due to dissolution of of the atmosphere into it.
Question 2: Explain giving reasons. ‘The presence of CO reduces the amount of haemoglobin available in the blood for carrying oxygen to the body cells’.
Solution: CO combines with haemoglobin of the red blood corpuscles about 300 times more easily than oxygen to form carboxy haemoglobin reversibly as follows:
Thus it is not able to combine with oxygen to form oxyhaemoglobin and transport of oxygen to different body cell cannot take place.
Question 3: Why is acid rain considered as a threat to ‘Taj Mahal’?
Solution: Taj Mahal is made of marble. The acid rain contains which attacks the marble thereby pitting it, decolourising it and making it lustreless.
Question 4: The acid rain does not contain
(a) Sulphuric acid
(b) Nitric acid
(c) Sulphurous acid
(d) Acetic acid
Solution: Nitrogen oxides & acidic soots. Sulphurdioxide & nitrogen dioxide interact with water vapours in presence of sunlight to form sulphuric acid & nitric acid units.
Acid rain contains sulphuric acid, nitric acid, sulphurous acid but does not contain acetic acid.
Hence, the correct option is D.
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FAQs on Solved Examples: Environmental Chemistry - Mock Tests for JEE Main and Advanced 2026
| 1. What is environmental chemistry? |  |
Ans. Environmental chemistry is the branch of chemistry that deals with the study of chemical processes and compounds occurring in the environment. It focuses on understanding how pollutants are formed, transported, and transformed in the air, water, and soil, and their impact on ecosystems and human health.
| 2. How does environmental chemistry contribute to solving environmental issues? | |
Ans. Environmental chemistry plays a crucial role in addressing environmental issues by providing insights into the sources and behavior of pollutants. It helps in developing effective strategies for pollution control, remediation, and waste management. By studying the chemical reactions and interactions in the environment, environmental chemists can identify the potential risks and develop sustainable solutions.
| 3. What are the major sources of environmental pollution? | |
Ans. The major sources of environmental pollution include industrial activities, transportation emissions, agricultural practices, improper waste disposal, and household activities. These sources release various pollutants such as greenhouse gases, heavy metals, pesticides, and toxic chemicals, which can contaminate air, water, and soil, leading to environmental degradation.
| 4. How does environmental chemistry study the impact of pollutants on human health? | |
Ans. Environmental chemistry investigates the fate and behavior of pollutants in the environment and their potential effects on human health. It analyzes the pathways through which pollutants enter the human body, their accumulation, and the mechanisms by which they cause adverse health effects. By studying these aspects, environmental chemists can assess the risks and develop strategies for minimizing exposure to harmful substances.
| 5. What are some examples of environmental chemistry applications in real-world scenarios? | |
Ans. Environmental chemistry finds applications in various real-world scenarios. Some examples include studying the impact of air pollutants on respiratory diseases, analyzing the levels of contaminants in drinking water sources, assessing the effectiveness of wastewater treatment processes, and developing environmentally friendly technologies for waste management. Additionally, environmental chemistry is also involved in the evaluation and regulation of chemicals used in industries to ensure their safe and sustainable use.
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