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Concentrated sodium hydroxide can separa...

Concentrated sodium hydroxide can separate a mixture of

A

`Zn^(2+)` and `Pb^(2+)`

B

`Al^(3+)` and `Zn^(3+)`

C

`Cr^(3+)` and `Fe^(3+)`

D

`Al^(3+) and Cr^(3+)`

Text Solution

Verified by Experts

The correct Answer is:
C
When `Cr^(3+)` reacts with conc. `NaOH`
`Cr^(3+) + 3OH^(-) to Cr(OH)_(3)`
Which further reacts with excess of NaOH :
`Cr(OH)_(3) + OH^(-) to Cr(OH)_(4)^(-)` (green colour solution)
Whereas `Fe(OH)_(3)` precipitated due to low solubility.
`Fe^(3+) + 3OH^(-) to Fe(OH)_(3) darr`
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