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How do colloids acquire a charge? Why is...

How do colloids acquire a charge? Why is ferric hydroxide/aluminium hydroxide sol prepared in the experiment, positively charged while arsenious sulphide sol is negatively charged?

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Knowledge Check

  • Ferric hydroxide sol is prepared by

    A
    treating ferric chloride with dilute sodium hydroxide solution
    B
    treating ferric chloride with dilute ammonium hydroxide solution
    C
    adding ferric chloride solution to boiling water
    D
    any onhe of the above methods

  • Identify the positively charged sol

    A
    Haemoglobin (blood)
    B
    `As_(2)S_(3)`
    C
    Clay
    D
    Gold sol.

  • Which of the following is/are negatively charged sol?

    A
    Gold sol
    B
    Prussian blue dye
    C
    Haemolobin
    D
    Starch