Surface Chemistry - NCERT
adsorption or physisorption. When the gas molecules or atoms are held to the solid surface by chemical bonds, the adsorption is termed chemical adsorption or chemisorption. The chemical bonds may be covalent or ionic in nature. Chemisorption involves a high energy of activation and is, therefore, often referred to as activated adsorption.
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www.ncert.nic.in317 Alcohols, Phenols and Ethers Allylic and benzylic alcohols may be primary, secondary or tertiary. (ii) Compounds containing C OHsp2 − bond: These alcohols contain —OH group bonded to a carbon-carbon double bond i.e., to a
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ncert.nic.inby electr on transfer and the for mation of ionic crystalline compounds. His views have pr oved to be of gr eat value in the understanding and systematisation of the ionic compounds. At the same time he did recognise the fact that a lar ge number of compounds did not fit into these concepts. 4.1.1 Octet Rule Kössel and Lewis in 1916 developed an