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An orange coloured solution acidified wi...

An orange coloured solution acidified with `H_2SO_4` and treated with a substance `'X'` gives a blue coloured solution of `CrO_5`. The substance `'X'` is

A

`H_(2)O_(2)`

B

`H_(2)O`

C

`dil HCl`

D

`Conc HCl`

Text Solution

Verified by Experts

The correct Answer is:
D
`Kr_(2)Cr_(2)O_(7)` an orange coloured solution, on acidification with dil `H_(2)SO_(4)` is oxidised by `H_(2)O_(2)` to blue peroxide of chromium, `CrO_(5)`, which is unstable.
`{:(" "K_(2)Cr_(2)O_(7)+H_(2)OSO_(4)toK_(2)SO_(4)+H_(2)Cr_(2)O_(7)),(" "[H_(2)O_(2)toH_(2)O+[O]]xx4),(" "H_(2)Cr_(2)O_(7)+4[O]to2CrO_(5)+H_(2)O),(ulbar(K_(2)Cr_(2)O_(7)+H_(2)SO_(4)+4H_(2)O_(2)to2CrO_(5)+K_(2)SO_(4)+5H_(2)O)):}`
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