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CBSE Class 10 Science 2017 Outside Delhi Term II Set 2 Paper

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Question : 7 of 12
Marks: +1, -0
What happens when
(write chemical equation in each case)
(a) ethanol is burnt in air ?
(b) ethanol is heated with excess conc. H2SO4\mathrm{H}_2\mathrm{SO}_4 at 443 K443\,\mathrm{K} ?
(c) a piece of sodium is dropped into ethanol?
Solution:  
(a) CH3CH2OH+3O2→   Air   2CO2+3H2O+\mathrm{CH}_3\mathrm{CH}_2\mathrm{OH}+3\mathrm{O}_2\xrightarrow{\;\text{ Air }\;}2\mathrm{CO}_2+3\mathrm{H}_2\mathrm{O}+ Heat + light
(b) CH3CH2OH→Δ,443 K   Conc.   H2SO4CH2=CH2\mathrm{CH}_3\mathrm{CH}_2\mathrm{OH}\xrightarrow[\Delta, 443\,\mathrm{K}]{\;\text{ Conc. }\;\mathrm{H}_2\mathrm{SO}_4}\mathrm{CH}_2=\mathrm{CH}_2
(c) 2CH3CH2OH+2Na→2CH3CH3ONa+H2↑2\mathrm{CH}_3\mathrm{CH}_2\mathrm{OH}+2\mathrm{Na}\rightarrow2\mathrm{CH}_3\mathrm{CH}_3\mathrm{ONa}+\mathrm{H}_2\uparrow
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