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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

Chromous ions

B

Aluminium ions

C

Barium ions

D

Iron ions.

Text Solution

Verified by Experts

`Al^(3+) +3OH^(-) to underset("White gelationous ppt.")(Al(OH)_(3))`
`Al(OH)_(3) (s) +NaOH (aq) to NaAlO_(2) (aq)+2H_(2)O (l)`.
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An inorganic compound (X) shows the following reactions : (a) It is white solid, exists as dimer and fumes in moist air. (b) It sublimes at 180^@ C and forms monomer on heating to 400^@ C . ( c) Its aqueous solution turns blue litmus red and gives a white precipitate with AgNO_(3) solution which is soluble in excess of NH_(4) OH . (d) Addition of NaOH to the solution of (A) gives a white gelatinous precipitate which is, however, soluble on excess of NaOH . Identify the compound (A) .

Knowledge Check

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

    A
    Chromium ions
    B
    Aluminium ions
    C
    Barium ions
    D
    Iron ions

  • 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
    `BaCl_(2)+NaOH`
    B
    `Na_(2)SO_(4)+NaOH`
    C
    `ZnSO_(4)+NaOH`
    D
    `AgNO_(3)+NaOH`

  • When a metal rod M is dipped into an aqueous colourless concentrated solution of compound N, the solution turns light blue. Addition of aqueous NaCl to the blue solution gives a white precipitate O. Addition of aqueous NH_(3) dissolves O and gives an intense blue solution. The final solution contains

    A
    `[Pb(NH_(3))_(4)]^(2+)` and `[CoCl_(4)]^(2-)`
    B
    `[Al(NH_(3))_(4)]^(3+)]` and `[Cu(NH_(3))_(4)]^(2+)`
    C
    `[Ag(NH_(3))_(2)]^(+)` and `[Cu(NH_(3))_(4)]^(2+)`
    D
    `[Ag(NH_(3))_(2)]^(+)` and `[Ni(NH_(3))_(6)]^(2+)`

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