Air Pollution & Emissions

The Montreal Protocol on Substances that Deplete the Ozone Layer (a protocol to the Vienna Convention for the Protection of the Ozone Layer) is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion . Bretton woods conference is related to establishment of World Bank and IMF in 1945.
Kyoyo protocol is related to Climate Change conference.
Nagoya protocol is related to Convention on BIological Diversity.

Statement 1 is correct: Fly ash finds various applications in construction, including brick manufacturing. Its pozzolanic properties improve the strength and durability of bricks.
Statement 2 is correct: Fly ash can partially replace Portland cement in concrete mixes. It reacts with the hydration byproducts of cement to form additional cementitious materials, leading to benefits like improved workability, reduced heat of hydration, and enhanced concrete performance.
Statement 3 is incorrect: Fly ash primarily consists of silicon dioxide (SiO2), aluminum oxide (Al2O3), and calcium oxide (CaO). However, it may also contain trace amounts of heavy metals like arsenic, mercury, and chromium.

Statement 1 is correct: Nanoparticles from industry can pollute air, water, and soil due to their small size and resistance to breakdown. This buildup can harm plants, and animals, and even contaminate drinking water. Statement 2 is correct: Nanoparticles can be inadvertently ingested by plants or animals, entering the food chain. As they move up the food chain, they can bioaccumulate in organisms, potentially causing harm at higher trophic levels. Statement 3 is correct: Some nanoparticles can trigger the production of free radicals in cells. Free radicals are highly reactive molecules that can damage cells and contribute to various health problems, including inflammation and cancer.

In a steel furnace, coke reacts with iron ore , releasing iron and generating CO and CO2 gases. Due to the use of coal , pollutants such as SOx and NOx are released, therefore all are correct options.

The correct answer is Nitrogen Dioxide, Ozone, and peroxyacetyl nitrate in the presence of sunlight. * Nitrogen Dioxide: Released mainly from vehicle exhaust and industrial emissions. * Sunlight: Sunlight's energy initiates the chemical reactions that form smog. * Volatile Organic Compounds: These are released from gasoline, paints, solvents, and other sources. They react with NO2 in the presence of sunlight. * Ozone: Ground-level ozone is a major component of photochemical smog, created by the reactions between NO2 and VOCs. * Peroxyacetyl Nitrate (PAN): PAN is another harmful component of smog, formed in the same reactions. The simplified process: Sunlight triggers reactions between Nitrogen Dioxide and VOCs, leading to the formation of ozone, PAN, and other noxious components of photochemical smog.

Excretion of urea by animals - Correct: Urea (CO(NH₂)₂) contains nitrogen. When animals excrete urea, microbes in the soil convert it into ammonia, and later into nitrates and nitrites — forms usable by plants. Thus, urea adds nitrogen to the soil indirectly. Burning of coal by man - Incorrect: Burning coal releases nitrogen oxides (NOₓ) into the atmosphere, not into the soil. These contribute to air pollution and acid rain, not direct soil enrichment. Death of vegetation - Correct: When plants die, their tissues decompose. Decomposers (bacteria and fungi) break down organic matter, releasing nitrogen compounds back into the soil. Hence, this process adds nitrogen to the soil naturally.

Acid rain is caused by the pollution of the environment by primarily sulphur dioxide and nitrogen oxides. These pollutants are released into the atmosphere during the burning of fossil fuels, like coal, for electricity generation and from the exhaust of vehicles. When they reach the atmosphere, they react with water, oxygen, and other chemicals to form sulphuric and nitric acid, which fall back to Earth as acid rain.