UPSC CSE Prelims
Environmental Pollution Previous Year Questions (PYQs)
Showing solved Previous Year Questions for Chapter: Environmental Pollution
Topic Breakdown: Scroll →
Artificial way of causing rainfall to reduce air pollution makes use of
Detailed Explanation:
Correct Answer: ✅ Option 1 (Silver iodide and Potassium iodide)
Artificial rainfall, also known as cloud seeding, is a weather modification technique used to induce precipitation. It is sometimes employed to reduce severe air pollution by washing pollutants and particulate matter out of the atmosphere.
✅ Option A is Correct: Silver iodide (AgI) and Potassium iodide (KI) are commonly used cloud-seeding agents. Their crystal structure resembles ice, helping water droplets condense and form rain.
❌ Option B is Incorrect: Silver nitrate is not a standard cloud-seeding material.
❌ Option C is Incorrect: Potassium nitrate is not used for inducing rainfall through cloud seeding.
❌ Option D is Incorrect: Neither silver nitrate nor potassium chloride is used as a conventional cloud-seeding agent.
Short Notes: Cloud Seeding
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Cloud seeding is an artificial technique used to enhance rainfall.
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Common seeding agents include silver iodide (AgI), potassium iodide (KI), and dry ice (solid CO₂).
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These substances act as condensation or ice nuclei.
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Cloud seeding is used to reduce air pollution, increase water availability, and mitigate drought.
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It works only when suitable clouds are already present.
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The technique cannot create clouds from a clear sky.
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Several countries, including India, China, UAE, and the USA, have experimented with cloud seeding.
Consider the following statements:
Statement I: Studies indicate that carbon dioxide emissions from cement industry account for more than 5% of global carbon emissions.
Statement II: Silica-bearing clay is mixed with limestone while manufacturing cement.
Statement III: Limestone is converted into lime during clinker production for cement manufacturing.
Which one of the following is correct in respect of the above statements?
Detailed Explanation:
Correct Answer: ✅ Option 2
The cement industry is a major contributor to global carbon emissions, accounting for roughly 5–8% of global CO₂ emissions. While both limestone and clay are essential raw materials in cement production, the primary source of CO₂ emissions is the calcination of limestone during clinker manufacturing.
✅ Statement I is Correct: Cement manufacturing contributes more than 5% of global CO₂ emissions, mainly due to clinker production and energy consumption.
✅ Statement II is Correct: Silica-bearing clay is mixed with limestone to provide silica, alumina, and iron oxides required for cement production.
✅ Statement III is Correct: During clinker production, limestone (CaCO₃) is heated and converted into lime (CaO), releasing large amounts of CO₂.
❌ Statement II does not explain Statement I: Mixing clay with limestone is a raw-material requirement and is not the direct cause of significant carbon emissions.
✅ Statement III explains Statement I: The conversion of limestone into lime (calcination) releases CO₂ and is the principal reason for high emissions from the cement industry.
Short Notes: Cement Industry and Carbon Emissions
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The cement industry contributes about 5–8% of global CO₂ emissions.
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The main raw materials are limestone and clay.
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Clinker is the intermediate product used to manufacture cement.
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Calcination reaction: CaCO₃ → CaO + CO₂.
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Around 60% of cement emissions come from the calcination process.
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The remaining emissions mainly come from fuel combustion in kilns.
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Low-carbon cement and carbon capture technologies are being developed to reduce emissions.
Consider the following:
I. Cigarette butts
II. Eyeglass lenses
III. Car tyres
How many of them contain plastic?
Detailed Explanation:
Correct Answer: ✅ Option 3 (All the three)
Many common items contain plastic materials, even when they do not appear to be made of plastic. Cigarette filters, modern eyeglass lenses, and car tyres all contain synthetic polymer-based materials that qualify as plastics or plastic-derived products.
✅ I. Cigarette Butts – Correct: Cigarette filters are primarily made of cellulose acetate, a synthetic plastic polymer.
✅ II. Eyeglass Lenses – Correct: Most modern eyeglass lenses are made from plastics such as polycarbonate or CR-39 resin, rather than glass.
✅ III. Car Tyres – Correct: Tyres contain synthetic rubber and other polymer-based materials derived from petrochemicals, which are forms of plastic.
Short Notes: Plastics in Everyday Life
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Cellulose acetate used in cigarette filters is a type of plastic.
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Most modern eyeglass lenses are made from polycarbonate due to its light weight and impact resistance.
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Car tyres contain both natural rubber and synthetic polymers.
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Synthetic rubber is produced from petroleum-based chemicals.
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Plastic waste can persist in the environment for hundreds of years.
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Cigarette butts are among the most common forms of plastic litter worldwide.
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Microplastics can be generated from the wear and tear of vehicle tyres.
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Consider the following statements:
Statement I: Activated carbon is a good and an attractive tool to remove pollutants from effluent streams and to remediate contaminants from various industries.
Statement II: Activated carbon exhibits a large surface area and a strong potential for adsorbing heavy metals.
Statement III: Activated carbon can be easily synthesized from environmental wastes with high carbon content.
Which one of the following is correct in respect of the above statements?
Detailed Explanation:
Correct Answer: ✅ Option 1
Activated carbon is one of the most widely used adsorbents in water and wastewater treatment. Its effectiveness comes from its highly porous structure and enormous surface area, while its low-cost production from carbon-rich wastes makes it an attractive and sustainable pollution-control material.
✅ Statement I is Correct: Activated carbon is extensively used to remove pollutants from industrial effluents and contaminated water through adsorption.
✅ Statement II is Correct: Activated carbon has a very large surface area and strong adsorption capacity, enabling it to capture heavy metals and other pollutants efficiently.
✅ Statement III is Correct: Activated carbon can be produced from agricultural and environmental wastes such as coconut shells, rice husks, sawdust, and other carbon-rich materials.
✅ Statement II explains Statement I: Its large surface area and adsorption capacity make it effective in pollutant removal.
✅ Statement III explains Statement I: Easy and low-cost production from waste materials makes it an attractive and sustainable remediation tool.
Short Notes: Activated Carbon
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Activated carbon is a highly porous carbon material used as an adsorbent.
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It has a surface area that can exceed 1,000 m²/g.
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Used in water purification, air filtration, and wastewater treatment.
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Effective in removing heavy metals, dyes, pesticides, and organic pollutants.
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Common raw materials include coconut shells, wood, coal, and agricultural residues.
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Works mainly through the process of adsorption, not absorption.
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It is widely used in environmental remediation and pollution control.
"Membrane Bioreactors" are often discussed in the context of:
Detailed Explanation:
Answer: Option 4 — Wastewater treatment technologies
Membrane Bioreactors (MBRs) are advanced wastewater treatment systems that combine conventional biological treatment processes with membrane filtration (microfiltration or ultrafiltration). They are highly efficient in removing contaminants, producing high-quality effluent, and require less space compared to traditional treatment methods. MBRs are widely used in municipal and industrial wastewater treatment applications due to their superior performance in removing suspended solids, pathogens, and organic pollutants.
📝 Short Notes: Membrane Bioreactors (MBRs)
- Technology: Combines biological degradation with membrane filtration in a single unit
- Membrane Types: Uses microfiltration (MF) or ultrafiltration (UF) membranes with pore sizes of 0.1-0.4 microns
- Advantages: High effluent quality, smaller footprint, complete retention of biomass, and better pathogen removal
- Applications: Municipal wastewater treatment, industrial effluent treatment, water reuse and recycling
- Limitations: Higher capital and operational costs, membrane fouling issues, energy-intensive operation
- Environmental Significance: Enables water reuse, reduces pollution load, and supports circular economy in water management
With reference to perfluoroalkyl and polyfluoroalkyl substances (PFAS) that are used in making many consumer products, consider the following statements :
- PFAS are found to be widespread in drinking water, food and food packaging materials.
- PFAS are not easily degraded in the environment.
- Persistent exposure to PFAS can lead to bioaccumulation in animal bodies.
Which of the statements given above are correct?
Detailed Explanation:
Answer: Option 4 — 1, 2 and 3
All three statements about PFAS (perfluoroalkyl and polyfluoroalkyl substances) are correct. These synthetic chemicals, often called 'forever chemicals', are widely used in consumer products and are characterized by their environmental persistence and bioaccumulation potential.
✅ Statement 1 – Correct: PFAS are widely detected in drinking water, food items, and food packaging materials due to their extensive use in consumer products and their ability to leach into the environment.
✅ Statement 2 – Correct: PFAS are called 'forever chemicals' because the strong carbon-fluorine bond makes them extremely resistant to environmental degradation processes.
✅ Statement 3 – Correct: Due to their persistence, PFAS accumulate in the tissues of animals and humans over time, leading to bioaccumulation and potential health risks.
📝 Short Notes: PFAS (Forever Chemicals)
- Full Form: Perfluoroalkyl and Polyfluoroalkyl Substances
- Nickname: 'Forever Chemicals' due to their extremely persistent nature
- Chemical Structure: Contain strong carbon-fluorine bonds that resist breakdown
- Common Uses: Non-stick cookware, water-repellent fabrics, firefighting foams, food packaging, cosmetics
- Environmental Persistence: Do not degrade naturally; accumulate in soil, water, and air
- Health Concerns: Bioaccumulation leads to potential cancer risk, liver damage, immune system effects, and developmental issues
- Global Concern: Found in blood samples of humans and wildlife worldwide; subject to increasing regulatory scrutiny
Consider the following statements :
Statement-I: Many chewing gums found in the market are considered a source of environmental pollution. Statement-II: Many chewing gums contain plastic as gum base.
Which one of the following is correct in respect of the above statements?
Detailed Explanation:
Answer: Option 1 — Both Statement-I and Statement-II are correct and Statement-II explains Statement-I
Chewing gums are a significant source of environmental pollution, and Statement-II directly explains why this is the case.
✅ Statement-I – Correct: Many chewing gums found in the market are considered a source of environmental pollution due to their non-biodegradable nature and improper disposal, leading to persistent litter in public spaces.
✅ Statement-II – Correct: Many chewing gums contain plastic polymers (such as polyisobutylene, polyvinyl acetate, or polyethylene) as their gum base, which makes them non-biodegradable and environmentally persistent.
Explanation: Statement-II explains Statement-I because the presence of plastic-based gum base is the primary reason why chewing gums become environmental pollutants. These synthetic polymers do not decompose naturally and remain in the environment for years, creating cleanup challenges and contributing to plastic pollution.
📝 Short Notes: Chewing Gum and Environmental Pollution
- Gum Base Composition: Modern chewing gums typically use synthetic polymers (plastics) like polyisobutylene and polyvinyl acetate instead of natural chicle latex.
- Non-Biodegradable Nature: These plastic-based gum bases can take years to decades to break down in the environment, persisting as microplastic pollution.
- Urban Pollution: Discarded chewing gum is one of the most common forms of street litter, requiring expensive removal processes (often using chemical solvents or freezing techniques).
- Environmental Impact: Improperly disposed gum contributes to plastic pollution, can harm wildlife if ingested, and creates unsightly stains on pavements and public infrastructure.
- Biodegradable Alternatives: Some companies are now developing plant-based, biodegradable gum alternatives to address environmental concerns.
According to the Environmental Protection Agency (EPA), which one of the following is the largest source of sulphur dioxide emissions?
Detailed Explanation:
Answer: Option 4 — Power plants using fossil fuels
Power plants burning fossil fuels, particularly coal, are the largest source of sulfur dioxide (SO₂) emissions globally according to the EPA. Coal contains high levels of sulfur, and when combusted for electricity generation, it releases substantial amounts of SO₂ into the atmosphere. While ships using bunker fuel, metal extraction processes, and locomotives also contribute to SO₂ emissions, their combined contribution is significantly lower than emissions from fossil fuel-based power generation.
📝 Short Notes: Sulfur Dioxide (SO₂) Emissions
- Primary Source: Coal-fired power plants are responsible for approximately 65-70% of global SO₂ emissions, as coal contains 0.5-3% sulfur by weight.
- Ships: Maritime vessels using heavy bunker fuel (high sulfur content) are the second major source, especially in coastal and port areas; regulations like MARPOL Annex VI now limit sulfur content in marine fuels.
- Metal Smelting: Extraction of metals like copper, zinc, and lead from sulfide ores releases SO₂ during roasting and smelting processes, contributing 5-10% of total emissions.
- Locomotives: Diesel-powered trains contribute minimally to SO₂ emissions due to lower sulfur content in diesel fuel and relatively smaller fuel consumption compared to power plants.
- Environmental Impact: SO₂ causes acid rain, respiratory problems, and contributes to particulate matter (PM2.5) formation; it also damages vegetation and corrodes buildings.
- Control Measures: Flue gas desulfurization (FGD/scrubbers), switching to low-sulfur fuels, and renewable energy transition are key mitigation strategies.
Consider the following statements regarding mercury pollution:
- Gold mining activity is a source of mercury pollution in the world.
- Coal-based thermal power plants cause mercury pollution.
- There is no known safe level of exposure to mercury.
How many of the above statements are correct?
Detailed Explanation:
Answer: Option 2 — Only two
Two out of three statements regarding mercury pollution are correct. Gold mining activities and coal-based thermal power plants are both significant sources of mercury pollution globally. However, the claim that there is "no known safe level" is scientifically inaccurate, as regulatory bodies like WHO have established reference doses and tolerable intake levels for mercury exposure.
✅ Statement 1 – Correct: Gold mining, especially artisanal and small-scale mining, uses liquid mercury to amalgamate with gold particles, releasing significant mercury into water bodies and forests, notably in regions like the Amazon.
✅ Statement 2 – Correct: Coal-based thermal power plants (TPPs) are the largest anthropogenic source of mercury emissions, releasing mercury through fly ash and flue gases; studies show TPPs contribute over 80% of mercury emissions in countries like India.
❌ Statement 3 – Incorrect: While mercury is highly toxic, regulatory and scientific bodies establish safe exposure thresholds; WHO's Provisional Tolerable Weekly Intake for methylmercury is 1.6 µg/kg body weight/week, and drinking water limit is 1 µg/litre, demonstrating that safe levels do exist below which health risks are minimal.
📝 Short Notes: Mercury Pollution
- Sources of Mercury Pollution: Coal-fired power plants (largest source), artisanal gold mining, chlor-alkali industry, waste incinerators, cement production, and volcanic eruptions.
- Mercury in Environment: Converts to toxic methylmercury in aquatic systems through bacterial action; bioaccumulates in fish and biomagnifies up the food chain.
- Health Effects: Damages nervous system, kidneys, and developing fetuses; causes Minamata disease (severe neurological syndrome); particularly harmful to children and pregnant women.
- Minamata Convention: Global treaty (2013) to protect human health and environment from anthropogenic mercury emissions and releases; India ratified in 2018.
- Safe Exposure Levels: WHO guidelines: 1.6 µg/kg body weight/week for methylmercury; 1 µg/litre for drinking water; concept of "dose makes the poison" applies.
- Mercury from Coal Plants: Indian coal contains 0.05-0.5 ppm mercury; released during combustion; fly ash disposal in ponds creates aquatic ecosystems contaminated with mercury.
In the context of WHO Air Quality Guidelines, consider the following statements:
- The 24-hour mean of PM2.5 should not exceed 15 ug/m³ and annual mean of PM2.5 should not exceed 5 ug/m³.
- In a year, the highest levels of ozone pollution occur during the periods of inclement weather.
- PM10 can penetrate the lung barrier and enter the bloodstream.
- Excessive ozone in the air can trigger asthma.
Which of the statements given above are correct?
Detailed Explanation:
Answer: Option 2 — 1 and 4 only
The WHO Air Quality Guidelines (2021) set stringent limits for particulate matter and other pollutants to protect public health. Statement 1 correctly states WHO's recommended limits for PM2.5, and Statement 4 correctly identifies ozone's role in triggering asthma. However, statements 2 and 3 contain factual errors regarding ozone formation conditions and the penetration capabilities of different particulate matter sizes.
✅ Statement 1 – Correct: WHO guidelines (2021) recommend 24-hour mean of PM2.5 should not exceed 15 µg/m³ and annual mean should not exceed 5 µg/m³.
❌ Statement 2 – Incorrect: Ozone pollution peaks during sunny, hot, and stagnant weather conditions, not during inclement weather; sunlight drives the photochemical reactions that produce ground-level ozone.
❌ Statement 3 – Incorrect: PM2.5 (not PM10) can penetrate the lung barrier and enter the bloodstream; PM10 particles are too large and typically deposit in the upper airways and bronchi.
✅ Statement 4 – Correct: Excessive ozone in the air irritates the respiratory system, triggers asthma attacks, and exacerbates other respiratory conditions.
📝 Short Notes: Air Pollutants and Health Effects
| Pollutant | Size/Characteristics | Health Impact | Formation Conditions |
|---|---|---|---|
| PM10 | Particles ≤10 µm | Deposits in upper airways; causes respiratory irritation, bronchitis | Dust, construction, combustion |
| PM2.5 | Particles ≤2.5 µm (fine) | Penetrates deep into lungs and enters bloodstream; affects heart, brain, organs | Combustion, vehicular emissions, industrial processes |
| Ground-level Ozone (O₃) | Secondary pollutant | Triggers asthma, reduces lung function, respiratory inflammation | Formed by photochemical reactions in sunlight (NOx + VOCs) |
- WHO Air Quality Guidelines (2021): PM2.5 annual mean: 5 µg/m³; 24-hour mean: 15 µg/m³
- WHO Air Quality Guidelines (2021): PM10 annual mean: 15 µg/m³; 24-hour mean: 45 µg/m³
- Ozone peaks: During summer months with high temperature, strong sunlight, and stagnant air masses
- Ultrafine particles (PM0.1): Even smaller than PM2.5, can directly enter blood and organs
- India's National Ambient Air Quality Standards (NAAQS): Less stringent than WHO guidelines; PM2.5 annual: 40 µg/m³, 24-hour: 60 µg/m³
Consider the following;
- Carbon monoxide
- Nitrogen oxide
- Ozone
- Sulphur dioxide
Excess of which of the above in the environment is/are the cause(s) of acid rain?
Detailed Explanation:
Answer: Option 2 — 2 and 4 only
Acid rain is caused by the presence of nitrogen oxides (NOₘ) and sulphur dioxide (SO₂) in the atmosphere, which react with water vapor to form nitric acid and sulphuric acid respectively. Carbon monoxide and ozone are pollutants but do not directly contribute to acid rain formation.
✅ Statement 2 – Correct: Nitrogen oxides (NOₓ) react with water and oxygen in the atmosphere to form nitric acid (HNO₃), a primary component of acid rain.
❌ Statement 1 – Incorrect: Carbon monoxide (CO) is a pollutant that contributes to ground-level ozone formation but does not cause acid rain.
❌ Statement 3 – Incorrect: Ozone (O₃) is a secondary pollutant and does not act as a precursor for acid rain formation.
✅ Statement 4 – Correct: Sulphur dioxide (SO₂) reacts with atmospheric moisture to form sulphuric acid (H₂SO₄), the other major component of acid rain.
📝 Short Notes: Acid Rain
- Definition: Acid rain refers to precipitation (rain, snow, fog) with a pH below 5.6, caused by atmospheric pollution.
- Primary Causes: Emissions of sulphur dioxide (SO₂) from coal combustion and nitrogen oxides (NOₓ) from vehicle exhausts and industrial processes.
- Chemical Reactions: SO₂ + H₂O → H₂SO₃ (sulphurous acid) → H₂SO₄ (sulphuric acid); NOₓ + H₂O → HNO₃ (nitric acid).
- Environmental Effects: Acidification of lakes and streams, damage to forests, corrosion of buildings and monuments (especially marble and limestone), soil degradation.
- Human Health Impact: Respiratory problems due to fine particulate matter formed from SO₂ and NOₓ.
- Control Measures: Use of low-sulphur fuels, installation of scrubbers in industries, catalytic converters in vehicles, and promotion of renewable energy sources.
With reference to polyethylene terephthalate, the use of which is so widespread in our daily lives, consider the following statements:
- Its fibres can be blended with wool and cotton fibres to reinforce their properties.
- Containers made of it can be used to store any alcoholic beverage.
- Bottles made of it can be recycled into other products.
- Articles made of it can be easily disposed of by incineration without causing greenhouse gas emissions.
Which of the statements given above are correct ?
Detailed Explanation:
Answer: Option 1 — 1 and 3
Polyethylene terephthalate (PET) is a versatile polymer widely used in textiles and packaging. Statements 1 and 3 are correct as PET fibres can be blended with natural fibres to enhance properties, and PET bottles are highly recyclable. Statements 2 and 4 are incorrect because not all PET containers are suitable for storing all types of alcoholic beverages (especially high-proof spirits or at elevated temperatures due to potential chemical leaching), and incineration of PET inevitably produces greenhouse gas emissions, primarily CO₂.
✅ Statement 1 – Correct: PET fibres (polyester) are commonly blended with wool and cotton to improve wrinkle resistance, strength, and durability in textile applications.
❌ Statement 2 – Incorrect: While PET containers can store some alcoholic beverages, they are not suitable for all types, particularly high-alcohol content spirits or beverages stored at high temperatures, as chemicals may leach from the plastic.
✅ Statement 3 – Correct: PET bottles are among the most recycled plastics globally and can be reprocessed into new bottles, polyester clothing, carpets, automotive parts, and construction materials.
❌ Statement 4 – Incorrect: Incineration of PET releases greenhouse gases including carbon dioxide and potentially toxic compounds; it is not an environmentally friendly disposal method without causing emissions.
📝 Short Notes: Polyethylene Terephthalate (PET)
- Chemical Formula: (C₁₀H₈O₄)ₙ – a thermoplastic polymer resin of the polyester family
- Common Uses: Beverage bottles, food containers, synthetic fibres (polyester), packaging films, and engineering resins
- Recycling Code: #1 (PETE or PET) – one of the most widely recycled plastics worldwide
- Textile Applications: PET fibres (polyester) are blended with natural fibres like cotton and wool to enhance durability, wrinkle resistance, and moisture-wicking properties
- Recyclability: Can be mechanically or chemically recycled into rPET (recycled PET) for new bottles, clothing, carpets, and industrial materials
- Environmental Concerns: Non-biodegradable; incineration releases CO₂ and other pollutants; microplastic generation; requires proper waste management
- Storage Limitations: Not suitable for high-temperature storage or high-proof alcoholic beverages due to potential chemical leaching (acetaldehyde, antimony)
- Advantages: Lightweight, shatter-resistant, excellent barrier properties for gases and moisture, cost-effective, and energy-efficient to produce
Why is there a concern about copper smelting plants?
- They may release lethal quantities of carbon monoxide into environment.
- The copper slag can cause the leaching of some heavy metals into environment.
- They may release sulphur dioxide as a pollutant.
Select the correct answer using the codes given below.
Detailed Explanation:
Answer: Option 2 — 2 and 3 Only
Copper smelting plants are a major environmental concern due to their emission of sulfur dioxide and the potential for heavy metal leaching from copper slag. The primary gaseous pollutant is SO₂, not carbon monoxide.
❌ Statement 1 – Incorrect: Copper smelting plants do not typically release lethal quantities of carbon monoxide; the primary gaseous pollutant of concern is sulfur dioxide (SO₂).
✅ Statement 2 – Correct: Copper slag, a byproduct of smelting, contains heavy metals like arsenic, lead, and cadmium, which can leach into soil and groundwater, causing environmental contamination.
✅ Statement 3 – Correct: Copper smelting releases large amounts of sulfur dioxide because most copper ores are sulfide minerals (like chalcopyrite), and sulfur is oxidized to SO₂ during roasting and smelting processes.
📝 Short Notes: Environmental Concerns of Copper Smelting
- Primary Pollutant: Sulfur dioxide (SO₂) is the main gaseous emission from copper smelting, as copper ores are predominantly sulfide minerals.
- Copper Slag: Contains heavy metals (arsenic, lead, cadmium, mercury) that can leach into environment, contaminating soil and water resources.
- Acid Rain: SO₂ emissions contribute to acid rain formation, damaging ecosystems, crops, and infrastructure.
- Health Impacts: SO₂ causes respiratory problems; heavy metals from slag can bioaccumulate and cause neurological and developmental issues.
- Mitigation Measures: Use of scrubbers to capture SO₂, proper slag management, adoption of cleaner smelting technologies, and recovery of sulfur for sulfuric acid production.
R2 Code of Practices constitutes a tool available for promoting the adoption of
Detailed Explanation:
Answer: Option 1 — environmentally responsible practices in electronics recycling industry.
The R2 (Responsible Recycling) Code of Practices is a comprehensive set of standards specifically designed for the electronics recycling industry to ensure environmentally sound and socially responsible handling of electronic waste. It provides guidelines for data security, material handling, downstream vendor management, and worker health and safety in e-waste recycling operations.
📝 Short Notes: R2 Code of Practices
- Full Form: R2 stands for Responsible Recycling, developed for electronics recycling industry.
- Purpose: Establishes standards for safe, ethical, and environmentally responsible recycling of electronic equipment and e-waste.
- Key Areas Covered: Data security and destruction, material handling, downstream vendor accountability, environmental health and safety, worker protection.
- Certification: R2 certification is recognized globally as a mark of responsible e-waste recycling practices.
- Focus on E-Waste: Addresses growing concerns about toxic materials in electronics (lead, mercury, cadmium) and promotes proper disposal and recycling methods.
Triclosan considered harmful when exposed to high levels for a long time, is most likely present in which of the following?
Detailed Explanation:
Answer: Option 4 — Toiletries
Triclosan (TCS) is an antibacterial and antifungal agent commonly found in various personal care and consumer products. It is most prevalently present in toiletries such as toothpaste, soaps, hand sanitizers, body washes, and deodorants. Long-term exposure to high levels of triclosan has raised health and environmental concerns, leading to restrictions and bans in several countries.
📝 Short Notes: Triclosan
- Chemical Nature: Triclosan is a synthetic antimicrobial compound used to reduce or prevent bacterial contamination.
- Common Products: Found in antibacterial soaps, toothpaste, hand sanitizers, body washes, detergents, cosmetics, and some medical equipment.
- Health Concerns: Prolonged exposure may disrupt hormone regulation (endocrine disruption), contribute to antibiotic resistance, and cause skin irritation.
- Environmental Impact: Triclosan can persist in the environment, contaminate water bodies, and harm aquatic ecosystems.
- Regulatory Actions: The US FDA banned triclosan from over-the-counter antiseptic wash products in 2016; the EU restricted its use in cosmetics in 2014.
- Alternatives: Manufacturers are increasingly using safer alternatives like alcohol-based sanitizers and natural antimicrobial agents.