Tyndall effect is more effectively shown by:

In which of the following is the Tyndall effect $NOT$ observed?

Action of soap is due to emulsification and micelle formation. Comment.

Match List-$I$ with List-$II$.

List-$I$	List-$II$
$A$. Negatively charged sol	$I$. $Fe_{2}O_{3} \cdot xH_{2}O$
$B$. Macromolecular colloid	$II$. $CdS$ sol
$C$. Positively charged sol	$III$. Starch
$D$. Cheese	$IV$. $A$ gel

Choose the correct answer from the options given below:

Ferric hydroxide sol is a positively charged colloid. The coagulating power of $NO_3^-$,$SO_4^{2-}$,and $PO_4^{3-}$ ions would be in the order:

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of $As_2S_3$ are given below:
$I$. $(NaCl) = 52,$
$II$. $(BaCl_2) = 0.69,$
$III$. $(MgSO_4) = 0.22$
The correct order of their coagulating power is: