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If a salt solution containing Fe^(2+) is...

If a salt solution containing `Fe^(2+)` is not treated with a few drops of `HNO_(3)` before starting for group III the ppt. obtained in group III will be

A

redish brown in colour

B

dirty green in colour

C

black

D

white

Text Solution

Verified by Experts

If `Fe^(2+)` ions are not oxidised to `Fe^(3+)` ions before proceeding for group III, dirty green ppt. of `Fe(OH)_(2)` will be obtained.
`Fe^(2+) +2NH_(4)OH to underset("Dirty green")(Fe(OH)_2)+NH_(4)^(+)`
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Knowledge Check

  • Few drop of HNO_(3) are added to group if before precoodinh to group III in order to :

    A
    Covert `Fe^(2+)` to `Fe^(3+)`
    B
    Convert` Fe^(3+)` to `Fe^(2+)`
    C
    ppt group III
    D
    None of these

  • Cone HNO_(3) is added before proceeding to test for group II This is to

    A
    Convent `Fe^(+2)` ion `Fe^(+3)` ion
    B
    Oxidise any remaining `H_(2)S`
    C
    From nitrate which give grandar precipitate
    D
    Increases ionisation of `NH_(4)OH`

  • On the addition of a solution containing CO_(4)^(2–) ions to the solution of Ba^(2+), Sr^(2+) and Ca^(2+) ions, the ppt obtained first will be of-

    A
    `CaCO_(4)`
    B
    `SrCrO_(4)`
    C
    `BaCrO_(4)`
    D
    a mixture of all the three
    • DINESH PUBLICATION-PRINCIPLES RELATED TO PRACTICAL CHEMISTRY-Brain teasers-40
    1. If a salt solution containing Fe^(2+) is not treated with a few drops ...

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