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the colloidal sols are purified by...

the colloidal sols are purified by

A

dialysis

B

peptization

C

filtration

D

oxidation

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The correct Answer is:
A
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Colloids can be purified by :

In a colloidal state, the particle size of he dispersed phase ranges between 10^(3) to 10^(6) pm and the colloidal sol is of heterogeneous nature. Depending upon the ease with which these sols are formed, the colloidal sols are cassified as lyophilic and lyophobic. THe stability of a colloidal sol is due to the presence of charge on the sol particles and the neutralisation of the same is known as coagulation or precipitation. The coagulationg power of the active ions of he electrolytes can be compared with the help of Hardy-Schulze Law. The protecting power of the lyophilic sols can be compared with the help of gold number. Lesser the value of gold number, more will be the protecting power of the lyophilic sol. The areseneous sulphide sol has negative (-) charge. The maximum power to precipitate it is of :

Knowledge Check

  • Collioidal sols can be purified by

    A
    dialysis
    B
    ultrafiltration
    C
    ultracentration
    D
    ultracentrifugation

  • Colloidal solutions are purified by dialysis. (r) In the process of dialysis, colloidal particles pass through parchment paper.

    A
    IF both (A) and (r) are correct and (r) is the correct explanation for (a).
    B
    If both (a) and (r) are correct but (r) is not the correct explanation for (a).
    C
    IF (a) is correct but (r) is incorrect.
    D
    If (a) is incorrect but (r) is correct.

  • In a colloidal state, the particle size of he dispersed phase ranges between 10^(3) to 10^(6) pm and the colloidal sol is of heterogeneous nature. Depending upon the ease with which these sols are formed, the colloidal sols are cassified as lyophilic and lyophobic. THe stability of a colloidal sol is due to the presence of charge on the sol particles and the neutralisation of the same is known as coagulation or precipitation. The coagulationg power of the active ions of he electrolytes can be compared with the help of Hardy-Schulze Law. The protecting power of the lyophilic sols can be compared with the help of gold number. Lesser the value of gold number, more will be the protecting power of the lyophilic sol. Lyophilic sols are more stable than lyophobic sols because

    A
    The colloidal particles have positive charge
    B
    The colloidal particles have no charge
    C
    The colloidal particles are solvated
    D
    There are strong electrostatic repulsions between the negatively charged colloidal particules.

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