(C) Since the two sols are oppositely charged,they undergo mutual coagulation upon mixing due to neutralization of charges. Therefore,the statement th

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Mixing the two sols has no effect.

(C) Since the two sols are oppositely charged,they undergo mutual coagulation upon mixing due to neutralization of charges. Therefore,the statement that 'mixing the two sols has no effect' is incorrect.

Class 12 Chemistry Surface Chemistry Colloids, Emulsion, Gel and Their properties with application

Medium

$Fe(OH)_3$ sol and gold sol are positively and negatively charged,respectively. Which of the following statements is incorrect?

A
Coagulation of both sols can be carried out by electrophoresis.
B
Both sols can be coagulated by sodium sulfate solution.
C
Mixing the two sols has no effect.
D
Gold sol is coagulated more rapidly than $Fe(OH)_3$ sol by magnesium chloride solution.