Transcription of HYDROGEN - NCERT
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HYDROGEN - NCERT
276 CHEMISTRY. UNIT 9. HYDROGEN . d he HYDROGEN , the most abundant element in the universe and the third most abundant on the surface of the globe, is being visualised as the major future source of energy. is After studying this unit, you will be able to present informed opinions on the bl position of HYDROGEN in the periodic table; HYDROGEN has the simplest atomic structure among all the identify the modes of occurrence pu elements around us in Nature. In atomic form it consists and preparation of dihydrogen on of only one proton and one electron. However, in elemental a small and commercial scale;. describe isotopes of HYDROGEN ;. form it exists as a diatomic (H2) molecule and is called explain how different elements dihydrogen .
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 ( ) ( ) COgHOg COgHg+⎯⎯⎯⎯ 222catalyst →+ This is called water-gas shift reaction. Carbon dioxide is removed by scrubbing with sodium arsenite solution. Presently ~77% of the ...
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