Test: Control of Environmental Pollution and pollutants - JEE MCQ

Sink is a medium which consumes pollutants from the environment. Pollutants refer to compounds which are harmful for our environment. Soil also acts as a sink for carbon monoxide. Since soil is a natural medium,microorganisms present in soil.

Green chemistry may be defined as the programme of developing new chemical products and chemical processes or making improvements in the already existing compounds and processes so as to make less harmful to human health and environment. This means the same as to reduce the use and production of hazardous chemicals. i.e. correct answer is option (b).

Replacement of earlier used tetrachloroethene as solvent for dry cleaning by liquid CO₂ results in less harm to ground water.

Ethanal is commerically prepared by one step oxidation of ethene in the presence of ionic catalyst in aqueous medium with an yield of 90%.

Green chemistry is related to ecofriendly purposes.
Since, plastics are non-biodegradable, they cause pollution. Therefore, using plastics cans for neatly storing substances will not come under green chemistry.

Green chemistry is the different process and methods that helps in minimizing the effects of pollution and eliminating the hazardous substances. It takes care that no products add to the environmental pollution. So using plastic cans does not come under green chemistry.

All the given statements are true for about waste recycling.

Addition of phosphate and nitrate fertilizers into water leads to nutrient enrichment or eutrophication.

Environmental pollution has following effects:
1. Effects on Humans: The effects of environmental pollution on humans are mainly physical, but can also turn into neuro-affections in the long term.
2. Effects on Animals: Environmental pollution mainly affects animal by causing harm to their living environment, making it toxic for them to live in
3. Effects on Plants: As for animals, plants, and especially trees, can be destroyed by acid rains (and this will also have a negative effect on animals as well, as their natural environment will be modified), ozone in the lower atmosphere block the plant respiration, and harmful pollutants can be absorbed from the water or soil.
4. Effects on the Ecosystem: In short, environmental pollution, almost exclusively created by human activities, has a negative effect on the ecosystem, destroying crucial layers of it and causing an even more negative effect on the upper layers.

Most abundant hydrocarbon pollutant is methane.

PAH (Poly Aromatic Hydrocarbon)

NO₂ is involved in photochemical smog. When it is exposed to ultraviolet radiation, the NO₂ molecule is known to undergo a complex series of hydrocarbon reactions to produce the photochemical smog components. These components include a mixture of ozone, aldehydes, nitric acid, peroxyacyl nitrates (PANs) and many other secondary pollutants.

CO, CO₂ and SO₂ are released from iron and steel industries.

Aerobic oxidation is caused by aerobic bacteria in presence of O₂.

Ozone is present in stratosphere