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Which of the following salt solution would coagulate the colloid solution formed whenFeCl_{3} is added to NaOH solution, at the fastest rate? 

Option: 1

10 \mathrm{~mL}$ of $0.1 \mathrm{~mol}\; \mathrm{dm}^{-3} \mathrm{Na}_2 \mathrm{SO}_4


Option: 2

10 \mathrm{~mL}$ of $0.2 \mathrm{~mol}\: \mathrm{dm}^{-3} \mathrm{AlCl}_3


Option: 3

10 \mathrm{~mL}$ of $0.1 \mathrm{~mol}\: \mathrm{dm}^{-3} \mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2


Option: 4

10 \mathrm{~mL}$ of $0.15 \mathrm{~mol} \: \mathrm{dm}^{-3} \mathrm{CaCl}_2


Answers (1)

best_answer

\mathrm{FeCl}_3+\mathrm{NaOH} \rightarrow \mathrm{Fe}(\mathrm{OH})_3 / \mathrm{OH}^{-}

Negative colloidal particle

Positive ion required for coagulation of sol.

Posted by

Rishi

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