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Question

Which of the following ions has the least flocculation value?


A

Cl-

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B

SO42-

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C

PO43-

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D

[Fe(CN)6]4-

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Solution

The correct option is A

Cl-


Explanation for the correct option:

A. Cl-

  • The flocculation value is the minimum amount of electrolyte added to cause the coagulation (precipitation) of the colloidal solution.
  • The flocculation value is directly proportional to the charge of the ion. Thus, the greater the charge of the ion, the more is the flocculation value.
  • Of the given ions, the Chloride ion (Cl-) has the least charge of -1, thus it has the least flocculation value.

The explanation for the incorrect options:

B. Sulphate ion (SO42-) has -2 charge which is greater than the charge of Cl-.

C. Phosphate ion (PO43-) has -3 charge which is greater than the charge of Cl-.

D. [Fe(CN)6]4- has -4 charge which is greater than the charge of Cl-.

Hence, the correct option is A, Cl-.


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