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

redish brown in colour

dirty green in colour

black

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

Covert `Fe^(2+)` to `Fe^(3+)`

Convert` Fe^(3+)` to `Fe^(2+)`

ppt group III

None of these

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

Convent `Fe^(+2)` ion `Fe^(+3)` ion

Oxidise any remaining `H_(2)S`

From nitrate which give grandar precipitate

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-

`CaCO_(4)`

`SrCrO_(4)`

`BaCrO_(4)`

a mixture of all the three