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  4. When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to formation of

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Q. When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to formation of

KEAMKEAM 2007The d-and f-Block Elements

Solution:

Acidified potassium dichromate is oxidized to unstable blue chromium peroxide, which is soluble in ether and produces blue coloured solution.
$ {{K}_{2}}C{{r}_{2}}{{O}_{7}}+{{H}_{2}}S{{O}_{4}}+4{{H}_{2}}{{O}_{2}}\to $ $ \underset{blue\text{ }colour}{\mathop{2Cr{{O}_{5}}+}}\,{{K}_{2}}S{{O}_{4}}+5{{H}_{2}}O $