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When H(2)O(2) is added to ice cold solut...

When `H_(2)O_(2)` is added to ice cold solution of acidified potassium dichromate in ether and the contents are shaken and allowed to stand

A

a blue colour is obtained in ether due to formation of `Cr_(2)(SO_(4))_(3)`

B

a blue colour is obtained in ether due to formation of `CrO_(5)`

C

a blue colour is obtained in ether due to formation of `CrO_(3)`

D

chromyl chloride is formed

Text Solution

Verified by Experts

The correct Answer is:
B
When `H_(2)O_(2)` is added to acidified potassium dichromate in ether solution, potassium dichromate is oxidised to blue peroxide of chromium `(CrO_(5))` which is soluble in ether and produces blue coloured solution.
`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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Knowledge Check

  • When H_(2)O_(2) is added to ice cold solution of acidified potassium dichromatic in ether and the contents are shaken and allowed to stand.

    A
    a blue colour is obtained in ether due to formation of `Cr_(2)(SO_(4))_(3)`
    B
    a blue colour is obtained in ether due to formation of `CrO_(5)`
    C
    a blue colour is obtained in ether due to formation of `CrO_(3)`
    D
    chromyl chloride is formed

  • When H_(2)O_(2) is added to ice cold solution of acidified potassium dichromate containing ether. The contents are shaken allowed to stand, then

    A
    blue colour is obtained in ether due to formation of `Cr_(2)(SO_(4))_(3)`
    B
    a blue colour is obtained in ether due to formation of `CrO_(5)`
    C
    `CrO_(3)` is formed which dissolves in ether to give blue colour
    D
    Chromyl chloride is formed.

  • When H_(2)O_(2) is added to acidified ferrous sulphate solution

    A
    Electrons are gained by `Fe^(2+)`
    B
    Electrons are lost by `Fe^(2+)`
    C
    No loss (or) gain of electrons
    D
    Iron hydroxide is precipitated

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    On shaking H_(2)O_(2) with acidified potassium dichromate and ether, etheral layer becomes

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