A solution of $\mathrm{CrO}_{5}$ in amyl alcohol has a....colour

JEE Main · 2023 · 29 Jan 2023 · Shift 2 · d and f Block Elements

A solution of

CrO_{5}

in amyl alcohol has a....colour

(A)Green
(B)Orange-Red
(C)Yellow
(D)Blue✓ Correct

Answer: (D)

Solution

When an acidified dichromate solution is treated with hydrogen peroxide, chromium peroxide

CrO X_{5}

is formed, a species with a butterfly structure carrying two peroxo linkages on chromium in its

+ 6

state. This peroxide is short-lived in water but is stabilised when taken up into an organic layer such as amyl alcohol, in which it shows a characteristic blue colour.

JEE Main · 2023 · 29 Jan 2023 · Shift 2 · Single correct option

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