Class 11th
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8 months agoContributor-Level 10
(a) Eutrophication: When the growth of algae increases in the surface of water, dissolved oxygen in water is reduced. This phenomenon is known as eutrophication. (Due to this growth of fish gets inhibited). (b) Pneumoconiosis: It is a disease which irritates lungs. It causes scarring or fibrosis of the lung. (c) Photochemical smog: Photochemical smog is formed as a result of photochemical decomposition of nitrogen dioxide and chemical reactions involving hydrocarbons. It takes place during dry warm season in presence of sunlight. It is oxidising in nature. (d) Classical smog: Classical smog is formed due to condensation of SO, vapours on particles of carbon in cold climate. It is generally formed during winter when there is severe cold.It is reducing in nature. |
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8 months agoContributor-Level 10
Toxic substance that is used to kill insects are called insecticides. For example: DDT, BHC.
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8 months agoContributor-Level 10
Carbon monoxide (CO), sulphur dioxide (SO2) and oxides of nitrogen (NO2).
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8 months agoNew answer posted
8 months agoContributor-Level 10
Green chemistry can be applied as mentioned in the following examples:
(i) In dry-cleaning, use of liquefied CO2 in place of tetrachloroethene.
(ii) In bleaching of paper using hydrogen peroxide instead of chlorine.
(iii) In the manufacture of chemicals like ethanal using environment-friendly chemicals and conditions.
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8 months agoContributor-Level 10
PCBs are polychlorinated biphenyls. They are contaminants of water. They are used as fluids in transformers and capacitors
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8 months agoContributor-Level 10
3.53. They have filled s-orbitals and hence do not tend to accept an additional electron. That is why energy is needed if an extra electron is to be added. Therefore, the electron gain enthalpies of Be and Mg are positive.
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8 months agoTaking an Exam? Selecting a College?
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