1.

When H_(2)O_(2) is shaken with an acidified solution of K_(2)Cr_(2)O_(7) in presence of ether, the ethereal layer turns blue due to the formation of

Answer»

`Cr_(2)O_(3)`
`CrO_(4)^(2-)`
`Cr_(2)(SO_(4))_(3)`
`CrO_(5)`

SOLUTION :Acidified `K_(2)Cr_(2)O_(7)` solution reacts with hydrogen peroxide to give a deep blue solution due to the formation of peroxo compound `CrO_(5).`
`K_(2)Cr_(2)O_(7)+H_(2)SO_(4)+4H_(2)O_(2)rarr 2CrO_(5)+K_(2)SO_(4)+5H_(2)O`


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