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HYDROGEN - NCERT
284 CHEMISTRYUNIT 9 After studying this unit, you will beable to present informed opinions on theposition of HYDROGEN in theperiodic table; identify the modes of occurrenceand preparation of dihydrogen ona small and commercial scale;describe isotopes of HYDROGEN ; explain how different elementscombine with HYDROGEN to formionic, molecular and non-stoichiometric compounds; describe how an understanding ofits properties can lead to theproduction of useful substances,and new technologies; understand the structure of waterand use the knowledge forexplaining physical and chemicalproperties; explain how environmental waterquality depends on a variety ofdissolved substances; differencebetween 'hard' and 'soft' water andlearn about water softening; acquire the knowledge aboutheavy water and its importance; understand the structure ofhydrogen peroxide, learn itspreparatory methods andproperties leading to themanufacture of useful chemicalsand cleaning of environment; understand and use certain , electron-deficient, electron-precise, electron-rich, hydrogeneconomy, hydrogenation , the most abundant element
The production of dihydrogen can be increased by reacting carbon monoxide of syngas mixtures with steam in the presence of iron chromate as catalyst. ( ) ( ) 673K ( ) ( ) COg HOg+ → +2 catalyst OgC Hg22 This is called water-gas shift reaction. Carbon dioxide is removed by scrubbing with sodium arsenite solution.
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