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QJEEAdv20Chc7a3: JEE Advanced 2020 Chemistry - Class 12 JEEAdv20Chc7a3 Solution: An acidified solution of potassium chromate was layered with an …

An acidified solution of potassium chromate was layered with an equal volume of amyl alcohol. When it was shaken after the addition of 1 mL of 3% H2O2, a blue alcohol layer was obtained. The blue colour is due to the formation of a chromium (VI) compound 'X'. What is the number of oxygen atoms bonded to chromium through only single bond in a molecule of X?

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When a solution of K2CrO4 is treated with amyl alcohol and acidified H2O2, the layer of amyl alcohol turns blue because acidified H2O2 converts K2CrO4 to CrO5 to given the blue colouration,

JEE Advanced 2020 Paper 2 Offline Chemistry - d and f Block Elements Question 15 English Explanation 1

The structure of CrO5 is :
JEE Advanced 2020 Paper 2 Offline Chemistry - d and f Block Elements Question 15 English Explanation 2

Number of oxygen atom bonded with chromium with single bond is = 4.

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