Environmental chemistry
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7 months agoContributor-Level 10
This is a Multiple choice Questions as classified in NCERT Exemplar
Options (i) and (ii) are correct since fertilizers contain phosphates as additives. The addition of phosphates in water enhances the growth of the algae. Such profuse growth of algae covers the water surface and reduces the oxygen concentration in water.
New answer posted
7 months agoContributor-Level 10
This is a Multiple choice Questions as classified in NCERT Exemplar
Options (iii) and (iv) are correct since clean water has BOD less than 5 ppm and polluted water has BOD value higher than 5 ppm. So, 10 BOD means highly polluted water. This process in which nutrient enriched water bodies support a dense plant population, which kills animal life by depriving it of oxygen and results in subsequent loss of biodiversity is termed as Eutrophication.
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7 months agoContributor-Level 10
This is a Multiple choice Questions as classified in NCERT Exemplar
Option (iv)
Using plastic cans for neatly storing substances is correct since use of plastic cans for neatly storing substances will not come under green chemistry because plastic is non-biodegradable and causes pollution.
New answer posted
7 months agoContributor-Level 10
This is a Multiple choice Questions as classified in NCERT Exemplar
Option (iii)
Ozone hole is thinning of the ozone layer of the stratosphere at some places is correct since it was found that a unique set of conditions were responsible for the ozone hole. In summer, nitrogen dioxide and methane react with chlorine monoxide and chlorine atoms forming chlorine sinks, preventing much ozone depletion, whereas in winter, special types of clouds called polar stratospheric clouds are formed over Antarctica.
Following reactions occur in the stratosphere.
CF2Cl2→CF2Cl + Cl?
Cl? +O3→ClO? + O2
ClO? + [ O ] →Cl? + O2
New answer posted
7 months agoContributor-Level 10
This is a Multiple choice Questions as classified in NCERT Exemplar
Option (iii) Peroxyacetyl nitrate is correct since,
NO2 (g) NO (g)+ [ O ] (i)
Oxygen atoms are very reactive and combine with the O2 in air to produce ozone.
[ O ] +O2 (g)→O3 (g) (ii)
The ozone formed in the above reaction (ii) reacts rapidly with the NO (g) formed in the reacti
New answer posted
7 months agoContributor-Level 10
This is a Multiple choice Questions as classified in NCERT Exemplar
Option (i) the reaction is endothermic and requires very high temperature is correct since dinitrogen and dioxygen are the main constituents of air. These gases do not react with each other at a normal temperature. The dissociation energy of N2is very high due to the presence of triple bond and it is very stable.
New answer posted
7 months agoContributor-Level 10
This is a Multiple choice Questions as classified in NCERT Exemplar
Option (ii) Troposphere is correct since the lowest region of atmosphere in which the human beings along with other organisms live is called troposphere. It extends up to the height of approximately 10 km from sea level.
New answer posted
7 months agoContributor-Level 10
This is a Multiple choice Questions as classified in NCERT Exemplar
Option (ii) i.e., It has low concentration of oxidizing agents is the answer since the common components of photochemical smog are ozone, nitric oxide, acrolein, formaldehyde and peroxyacetyl nitrate (PAN). Photochemical smog causes serious health problems and both ozone and PAN act as powerful eye irritants. Photochemical smog contains high concentrations of oxidants.
New answer posted
7 months agoContributor-Level 10
This is a Multiple choice Questions as classified in NCERT Exemplar
Option (iii)
i.e., Decrease in the amount of dissolved oxygen in water is the answer since organic waste is oxidized by microorganisms in the presence of dissolved oxygen. Hence, oxygen decreases in water as a result it is harmful for aquatic life.
New answer posted
7 months agoContributor-Level 10
This is a Multiple choice Questions as classified in NCERT Exemplar
Option (i) i.e., Ozone is not responsible for greenhouse effect is the answer since O3 is responsible for the greenhouse effect, its contribution is about 8% to 10%. About 75% of the solar energy reaching the earth is absorbed by the earth's surface, which increases its temperature. The rest of the heat radiates back to the atmosphere while some of the heat is trapped by gases such as carbon dioxide, methane, ozone, chlorofluorocarbon compounds (CFCs) and water vapour in the atmosphere. Thus, they add to the heating of the atmosphere. This is the reason behind glo
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