Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Effects on Materials - Air pollutants
Most air pollutants are reactive chemicals, so they react with most of the substances around. You may recall from your chemistry lessons in school that SO2 oxidises to form SO3 and when dissolved in water it forms sulphuric acid which is highly caustic. Sulphuric acid reacts with metals and their weak salts and forms corresponding sulphate. In this way, in air polluted with SO2, aluminium metal can form aluminium sulphate and lime stone and marble can form calcium sulphate called gypsum. Such reactions have caused damage to buildings, sculptures and other historical monuments made up of stone, plaster, marble or metal painted glass works. Some of them are from middle ages or even older. The stone in the Parthenon in Athens, has deteriorated more in the past 50 years from air pollution than it had in the previous 2000 years. Similarly, the statue of liberty is corroded from SO2 and NO2 and TajMahal from SO2 emitted by Mathura refineries. The sand stone statues get covered with black coating that contains large amounts of gypsum. When gypsum is formed in cracks, the expansion of its crystals causes the limestone to crumble away. Such damages are indeed costly as well as a great loss to society because many of them are irreplaceable works of art.
Since SO2, NO2 and O3 are strong oxidants; they soil, fade and deteriorate fabrics. Sulphur dioxide affects leather and plastic also. Ozone cracks wind shield wipers, tyres and other rubber products. Hydrogen sulphide reacts with metallic paints and tarnishes them by forming metallic sulphides. It tarnishes silverware and jewellery also. Particulate matter sullies and erodes the buildings. Soot and tar sticks to the building stones, painted surface and is difficult to remove. Such damages require a large sum of money for repair and maintenance.
Septa prevent oxygenated and deoxygenated blood. Give reason
right classification of protozoa up to class
What are the major factors of colloidal dispersion The adsorption of ions by colloidal particles is a major factor in stabilizing a colloidal dispersion, since the colloidal pa
how pollination occurs in Salvia?
Energy Cycle of Living Being Source of energy :All matter locks energy in the from of bonds between component molecules and atoms. This energy is the chemical ener
Processing of roughage Roughages constitute the bulk of the ration of farm animals and these include green fodder (leguminous and non-leguminous), grasses, and various crop re
Question 1 Discuss the Following a) Immune response b) Immunofluorescence test and its applications Question 2 Answer the following ques
Advanced Nervous Systems - General Trend In Evolution In higher groups of animals you will observe clear trends towards centralisation of the nervous system, to maximize effe
What are stomata? How do these structures participate in the plant transpiration? Stomata (singular, stoma) are small specialized passages for water and gases there in the epid
If glycogen degradation and glycogen synthesis were allowed to occur concurrently, the net effect would be hydrolysis of UTP, a so-called futile cycle. To stop this, b
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd