Potassium Dichromate Oxidation
Easychemistry
In acidic medium, Cr2O7²⁻ acts as an oxidizing agent reducing to:
Select the correct option:
Solution
Incorrect! Answer:
Cr3+
- Starting State: In Dichromate (Cr2O72−), Chromium is in the +6 oxidation state.
- The Reaction (Acidic): Cr2O72−+14H++6e−→2Cr3++7H2O.
- Observation: The orange solution of dichromate turns green due to the formation of hydrated Cr3+ ions.
- Stability: +3 is the most stable oxidation state for Chromium in aqueous acidic solution.
- Usage: This reaction is used in laboratory titrations and in breathalyzer tests for alcohol.
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About This Question
- Subject
- chemistry
- Chapter
- d- and f-block elements
- Topic
- potassium dichromate oxidation
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Cr3+
- Starting State: In Dichromate (Cr2O72−), Chromium is in the +6 oxidation state.
- The Reaction (Acidic): Cr2O72−+14H++6e−→2Cr3++7H2O.
- Observation: The orange solution of dichromate turns green due to the formation of hydrated Cr3+ ions.
- Stability: +3 is the most stable oxidation state for Chromium in aqueous acidic solution.
- Usage: This reaction is used in laboratory titrations and in breathalyzer tests for alcohol.
This easy difficulty chemistry question is from the chapter d- and f-block elements, covering the topic of potassium dichromate oxidation. It appeared in the 2025 exam.
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