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Oxidation of ethanal (CH₃CHO) with a strong oxidizing agent like K₂Cr₂O₇/H₂SO₄ yields ethanoic acid (CH₃COOH).
Ref: NCERT Class 12 Chemistry > Chapter 12: Aldehydes, Ketones and Carboxylic Acids > Topic: Nomenclature, Structure and Preparation of Aldehydes and Ketones
K 2 Cr 2 O 7 is an oxidizing agent, not used as a reducing agent.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Preparation and Properties of Potassium Dichromate and Permanganate
Chromite ore is oxidized with Na 2 CO 3 in the presence of air to form sodium chromate: 4FeCr 2 O 4 + 8Na 2 CO 3 + 7O 2 → 8Na 2 CrO 4 + 2Fe 2 O 3 + 8CO 2 . This is the key step in the preparation of K 2 Cr 2 O 7 .
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Preparation and Properties of Potassium Dichromate and Permanganate
Cr 2 O 7 2− + 14H + + 6e − → 2Cr 3+ + 7H 2 O (E° = +1.33 V).
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Actinoids and Comparison of Lanthanoids and Actinoids
Cr 2 O 7 2- oxidizes I - to I 2 and gets reduced to Cr 3+ (green).
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Actinoids and Comparison of Lanthanoids and Actinoids
Cr (+6 in Cr₂O₇²−) to +3 in CrCl₃: 4 Cr gain 12 electrons. Cl (-1 to 0): 6 Cl lose 12 electrons. Total = 12.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Oxidizing and Reducing Agents and Strength
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