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The coagulating power of electrolytes having ions $Na^{+}$,$Ba^{2+}$ and $Al^{3+}$ for arsenic sulphide sol increases in the order:

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:

Which of the following is not a macromolecular colloid?

Milk is an example of

Which one of the following properties of colloids is related to the scattering of light?

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