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A metal sulphide sol. can be flocculated...

A metal sulphide sol. can be flocculated by which one of the following ?

A

`[Fe(CN)_(6)]^(4-)`

B

`SO_(4)^(2-)`

C

`BaCl_(2)`

D

`Al^(3+)`

Text Solution

Verified by Experts

The correct Answer is:
D
Metal sulphide sol is negatively charged and can be coagulated by positive ions `(Al^(3+))`
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The Ellingham diagram for a number of metallic sulphides is shown below. Which of the following sulphides can not be reduced to metal by H_(2) at about 1000^(@)C ?

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Knowledge Check

  • Arsenic sulphide sol is negatively charged. Which of the following electrolytes would be most effective in its coagulation?

    A
    `BaCl_(2)`
    B
    `KCl`
    C
    `K_(4)[Fe(CN)_(6)]`
    D
    `AlCl_(3)`

  • As per hardy-schulze formulation, the flocculation values of the following for haemoglobin sol are in the order

    A
    `AlCl_(3) gt K_(3)[Fe(CN)_(6)] gt K_(2)CrO_(4) gt KBr = KNO_(3)`
    B
    `K_(3)[Fe(CN)_(6)] lt K_(2)CrO_(4) lt KBr = KNO_(3)=AlCl_(3)`
    C
    `K_(3)[Fe(CN_(6))]gtAlCl_(3) gt K_(2)CrO_(4) gt KBr gt KNO_(3)`
    D
    `K_(3)[Fe(CN)_(6)] lt K_(2)CrO_(4) lt AlCl_(3) lt KBr lt KNO_(3)`

  • For coagulation of Arsenious sulphide sol, which one of the following salt solution will be most effective

    A
    `AlCl_(3)`
    B
    `NaCl`
    C
    `BaCl_(2)`
    D
    `Na_(3)PO_(4)`

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