Q. what happens when
I. Ethanol is heated in presence of conc. sulphuric acid
II. yeast is mixed with molasses
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As H2SO4 or Sulpuric acid is a strong dehydrating agent ethanol gets dehydrated and forms ethene gas. Catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process. The water or H2O produced from the reaction gets mixed with sulphuric acid (H2SO4) and it gets diluted.
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When ethanol is heated with conc.sulphuric acid at 443k dehydration takes place and ethene is formed
CH2CH2OH -----------> CH2=CH2+H2O
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