Transcription of HYDROGEN - NCERT
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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 perox
Reactions with metals: With many metals it combines at a high temperature to yield the corresponding hydrides (section 9.5) H2(g) +2M(g) → 2MH(s); where M is an alkali metal Reactions wit h metal ions and metal oxides: It reduces some metal ions in aqueous solution and oxides of metals (less active than iron) into corresponding metals
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