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When H2O2 is added to ice cold solution of acidified potassium dichromate in ether and the contents are shaken and allowed to stand
  • a)
    A blue colour is obtained in ether due to formation of Cr2(SO4)3
  • b)
    A blue colour is obtained in ether due to formation of CrO5
  • c)
    A blue colour is obtained in ether due to formation of CrO3
  • d)
    Chromyl chloride is formed
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
When H2O2is added to ice cold solution of acidified potassium dichroma...
When H2O2 is added acidified potassium dichromate in ether solution, potassium dichromate is oxidised to blue peroxide of chromium (CrO5) which is soluble in ether and produces blue coloured solution.
K2Cr2O7 + H2SO4 + 4H2O2 2CrO5 + K2SO4 + 5H2O
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Most Upvoted Answer
When H2O2is added to ice cold solution of acidified potassium dichroma...
Explanation:
When hydrogen peroxide (H2O2) is added to an ice-cold solution of acidified potassium dichromate in ether, several reactions take place. Let's analyze each option to determine the correct answer:

a) A blue colour is obtained in ether due to the formation of Cr2(SO4)3:
This option suggests the formation of chromium(III) sulfate (Cr2(SO4)3). However, when acidified potassium dichromate reacts with hydrogen peroxide, the oxidation state of chromium changes from +6 to +5. Therefore, the formation of Cr2(SO4)3 is not possible in this reaction.

b) A blue colour is obtained in ether due to the formation of CrO5:
This option suggests the formation of chromium(V) oxide (CrO5). When acidified potassium dichromate reacts with hydrogen peroxide, the chromium(V) intermediate CrO5 is formed. This intermediate is responsible for the blue color observed in the ether layer.

c) A blue colour is obtained in ether due to the formation of CrO3:
This option suggests the formation of chromium(VI) oxide (CrO3). However, in the reaction between acidified potassium dichromate and hydrogen peroxide, the oxidation state of chromium changes from +6 to +5. Therefore, the formation of CrO3 is not possible in this reaction.

d) Chromyl chloride is formed:
Chromyl chloride (CrO2Cl2) is not formed in the reaction between acidified potassium dichromate and hydrogen peroxide. Chromyl chloride is formed when a chloride salt reacts with acidified potassium dichromate and concentrated sulfuric acid. It is not a product of the given reaction.

Therefore, the correct answer is option 'b' - A blue color is obtained in ether due to the formation of CrO5.
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When H2O2is added to ice cold solution of acidified potassium dichromate in ether and the contents are shaken and allowed to standa)A blue colour is obtained in ether due to formation of Cr2(SO4)3b)A blue colour is obtained in ether due to formation of CrO5c)A blue colour is obtained in ether due to formation of CrO3d)Chromyl chloride is formedCorrect answer is option 'B'. Can you explain this answer?
Question Description
When H2O2is added to ice cold solution of acidified potassium dichromate in ether and the contents are shaken and allowed to standa)A blue colour is obtained in ether due to formation of Cr2(SO4)3b)A blue colour is obtained in ether due to formation of CrO5c)A blue colour is obtained in ether due to formation of CrO3d)Chromyl chloride is formedCorrect answer is option 'B'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about When H2O2is added to ice cold solution of acidified potassium dichromate in ether and the contents are shaken and allowed to standa)A blue colour is obtained in ether due to formation of Cr2(SO4)3b)A blue colour is obtained in ether due to formation of CrO5c)A blue colour is obtained in ether due to formation of CrO3d)Chromyl chloride is formedCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for When H2O2is added to ice cold solution of acidified potassium dichromate in ether and the contents are shaken and allowed to standa)A blue colour is obtained in ether due to formation of Cr2(SO4)3b)A blue colour is obtained in ether due to formation of CrO5c)A blue colour is obtained in ether due to formation of CrO3d)Chromyl chloride is formedCorrect answer is option 'B'. Can you explain this answer?.
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