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18 g जल को (a ) सोडियम धातु द्वारा ,(b ) विद्युत अपघटन द्वारा पूर्णतः अपघटित किया जाता है|प्रत्येक अवस्था में उत्पन्न हाइड्रोजन के भार की गणना करें| विद्युत अपघटन के फलस्वरूप सा० ता० दा० (NTP ) पर ऑक्सीजन का कितना आयतन निकलता है?

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(a ) सोडियम धातु जल के साथ निम्नांकित समीकरण के अनुसार अभिक्रिया करती है|
` " "2Na" "+ 2H_2O " "to " "2NaOH " "+ H_2 `
` " " 2xx 18=36g " " 2g `
` because 36g` जल से हाइड्रोजन निकलता है,
` therefore 18" "( 2xx18)/( 36) =1.0gH_2 ` निकलेगा |
(b ) विद्युत अपघटन होने पर-
` " " 2H_2O " " to " " 2H_2 " "+O_2 `
` " " 2xx18=36" " 2xx 2=4g " " 22.4L `
` because " " 36g ` जल से ` 4g H_2 ` निकलता है|
` therefore" " 18g " "( 4xx18)/(36)" "= 2gH_2 `
पुनः ` because " " 36g ` जल NTP पर ` 22.4L O_2 ` देता है
`therefore " " 18g " "( 22.4xx18)/( 36) " "= 11.2LO_2 `

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