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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.
Presently ~77% of the industrial dihydrogen is produced from petro-chemicals, 18% from coal, 4% from electrolysis of aqueous solutions and 1% from other sources. 9.4 PROPERTIES OF DIHYDROGEN 9.4.1 Physical Properties Dihydrogen is a colourless, odourless, tasteless, combustible gas. It is lighter than air and insoluble in water. Its other physical
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