The coagulation of $400 \mathrm{~mL}$ of a positive colloid took place when $1.46 \mathrm{~g}$ of $\mathrm{HCl}$ was added to it without changing the volume much. What is the flocculation value of $\mathrm{HCl}$ for the colloid?

NEET UG CHEMISTRY MCQ: SURFACE CHEMISTRY

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The coagulation of

400 \mathrm{~mL}

of a positive colloid took place when

1.46 \mathrm{~g}

\mathrm{HCl}

was added to it without changing the volume much. What is the flocculation value of

\mathrm{HCl}

for the colloid?

View answer and explanation

Correct option: A

100

Option A (100) is correct because the flocculation value is the number of millimoles of electrolyte required to coagulate 1 liter of colloidal solution. We calculate the moles of HCl, convert to millimoles, and then adjust for the volume.

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