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Piyush365
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Asked: 2025-09-30T04:14:42+00:00 In:

Write chemical equation to show what happens when ethanol: (I) burns in oxygen/air. (II) is heated at 443 K in excess conc. sulphuric acid. (III) reacts with acidified potassium dichromate.

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(I) Combustion: C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O

(II) Dehydration: C₂H₅OH →[conc. H₂SO₄, 443 K] C₂H₄ + H₂O

(III) Oxidation: C₂H₅OH + [O] → CH₃CHO + H₂O (using acidified K₂Cr₂O₇)

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    1. Write chemical equation to show what happens when ethanol: (I) burns in oxygen/air. (II) is heated at 443 K in excess conc. sulphuric acid. (III) reacts with acidified potassium dichromate.

      I. When ethanol burns in air or oxygen, it reacts vigorously and is completely oxidised to form carbon dioxide and water, releasing heat and light energy in the form of a flame.

      II. When ethanol is heated strongly with excess concentrated sulphuric acid, a water molecule is removed from each ethanol molecule and ethene (an unsaturated hydrocarbon) is formed; this is called dehydration.

      III. When ethanol is treated with acidified potassium dichromate, it undergoes oxidation: the alcohol is converted into ethanoic acid (acetic acid) while the oxidising agent is reduced.

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