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On addition of aqueous NaOH to a salt so...

On addition of aqueous NaOH to a salt solution, a white gelatinous precipitate is formed, which dissolves in excess of alkali. The salt solution contains

A

Chromium ions

B

Aluminium ions

C

Barium ions

D

Iron ions

Text Solution

Verified by Experts

The correct Answer is:
B
`Al^(+3)+(OH^(-))_(3)to underset(("white ppt."))(Al(OH)_(3)`
Which is soluble in excess alkali.
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Knowledge Check

  • An unknown mixture contains one or two of the following: CaCO_(3),BaCl_(2),AgNO_(3),Na_(2)SO_(4),ZnSO_(4) and NaOH . The mixture is completely soluble in water and solution gives pink colour with phenolphthalein. When dilute hydrochloric acid is gradually added to the solution, a precipitate is formed which dissolved with further addition of the acid. Q. The aqueous solution of mixture gives white precipitate with dil. HCl which dissolves in excess of dil HCl . it confirms.

    A
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    B
    `Na_(2)SO_(4)+NaOH`
    C
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    B
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