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What changes occur when acidified CrO(4)...

What changes occur when acidified `CrO_(4)^(2-)` ion react with `H_(2)O_(2)` solution in presence of ether solvent?

A

Orange colour of solution turns blue

B

Oxidation state of Cr-atom decrease

C

Oxidation state of Cr-atom remains constant

D

Orange colour of solution turns green

Text Solution

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The correct Answer is:
A, C
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In which of the following there is a change in oxidation number ? (a) An aqueous solution of CrO_(4)^(2-) is acidified. (b) SO_(2) gas is passed through acidified Cr_(2)O_(7)^(2-) solution. (c) Cr_(2)O_(7)^(2-) solution is made alkaline. (d) CrO_(2)Cl_(2) is dissolved in NaOH.

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Knowledge Check

  • What changes occurs when acidfied CrO_(4)^(2-) ion reacts with H_(2)O_(2) solution in presence of ether solvent?

    A
    Orange colour of solution turns blue
    B
    Oxidation state of Cr-atom decrease
    C
    Oxidation state of Cr-atom remains constant
    D
    Orange colour of solution turns green

  • C_(2)H_(5)MgI reacts with HCOOC_(2)H_(5) in the presence of dry ether to give

    A
    Ethanol
    B
    Ethanoic acid
    C
    Propanal
    D
    Ethyl ethanoate

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

    A
    `CrO_(3)+H_(2)O+O_(2)`
    B
    `Cr_(2)O_(2)+H_(2)O+O_(2)`
    C
    `CrO_(5)+H_(2)O+K_(2)SO_(4)`
    D
    `H_(2)Cr_(2)O_(7)+H_(2)O+O_(2)`

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    Statements 1: Both CrO_(4)^(2-) and Cr_(2)O_(7)^(2-) ions when treated with acidified H_(2)O_(2) solution gives blue solution which turns green on standing. Statement 2: Blue solution of CrO_(5) is stabilised in the presence of organic solvent,e.g., ether, pyridine, etc.

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