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On adding a few drops of dilute $HCl$ or $FeCl_3$ to freshly precipitated ferric hydroxide,a red-coloured colloidal solution is obtained. This phenomenon is called:

For the coagulation of a negative sol,the species below,that has the highest flocculating power is:

Assertion: Animal skins are colloidal in nature.
Reason: Animal skin has positively charged particles.

The coagulating power of an ion for a given colloid depends on which of the following?

Match List-$I$ and List-$II$.
List-$I$ List-$II$
$A$. Osmosis $I$. Solvent molecules pass through semi permeable membrane towards solvent side.
$B$. Reverse osmosis $II$. Movement of charged colloidal particles under the influence of applied electric potential towards oppositely charged electrodes.
$C$. Electro osmosis $III$. Solvent molecules pass through semi permeable membrane towards solution side.
$D$. Electrophoresis $IV$. Dispersion medium moves in an electric field.

Choose the correct answer from the options given below:

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