NCERT Solutions For Class 12 Chemistry Chapter 15 PolymersPolymers are high molecular mass substances 10 3 — 10 7 u consisting of a very large number of simple repeating structural units joined together through covalent bonds in a linear fashion. They are also called macromolecules. Ex: polythene, nylon 6,6, bakelite, rubber, etc. On the basis of structure, polymers are classified as : i Linear polymers in which the monomers are joined together to form long straight chains of polymer molecules. For ex : LDPE, glycogen, etc.
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It covers the basic tenets of English Grammar, explaining the rules alongside providing an innumerous amount of exercises which help students understand how the rules are applied in real life. The book has been edited and updated in order to reflect the changes in style across the high school boards in India. In addition, this Hindi translation captures the essence of the English original, helping students from a Hindi medium understand the finer points of the book. Percival Christopher Wren was an English writer. Martin was an English linguist and teacher.
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Colombo, Milano, Italy. In this study, a polymer, prepared by crosslinking cyclodextrin CD by means of a polycarboxylic acid, was used for the removal of pollutants from spiked solutions and discharge waters from the surface treatment industry. Due to the structure of the polymer and its specific characteristics, such as the presence of carboxylic groups and CD cavities, the adsorption mechanism involves four main interactions: ion exchange, electrostatic interactions and precipitation for metal removal, and inclusion complexes for organics removal. In industrial discharge waters, competition effects appeared, especially because of the presence of calcium at high concentrations, which competed with other pollutants for the adsorption sites of the adsorbent. Although considerable efforts have been made by the industrial sector over the last 30 years, the problem of water pollution still remains a significant concern. Particularly affected by this issue are the discharge waters DWs of the surface treatment ST industries known for using large amounts of water and chemicals in their manufacturing processes.
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