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Acidified solution of chromic acid on tr...

Acidified solution of chromic acid on treatment with `H_(2)O_(2)` gives blue colour which is due to

A

`CrO_(3)+H_(2)O+O_(2)`

B

`CrO_(5)+H_(2)O`

C

`H_(2)Cr_(2)O_(7)+H_(2)O+O_(2)`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
`H_(2)Cr_(2)O_(7)+4O to underset("Blue peroxide of chromium")(2CrO_(5))+H_(2)O`
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Acidified solution of chromic acid on treatment with hydrogen peroxide yields

Acidified solution of K_(2)Cr_(2)O_(7) on treatment with H_(2)O_(2) yields :

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Potassium dichromate acts as a strong oxidising agent in the acidic medium. When heated with a metal chloride and conc. sulphuric acid, it gives orange red fumes. On passing these fumes through sodium hydroxide, it gives a yellow solution (X) and this acidified solution gives yellow precipitate (Y) with lead acetate. On heating potassium dichromate with KOH, it forms a yellow solution (Z) which on acidification changes to orange colour. Acidified solution of dichromate ion gives deep blue colour with H_2O_2 due to the formation of (P) The yellow solution (Z) on acidification gives

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