According to the Hardy-Schulze rule,the flocculating power of an ion increases with:

The gold numbers of gelatin,haemoglobin,and sodium acetate are $0.005$,$0.05$,and $0.7$ respectively. Their protective power will be in the order:

$A$ is a protecting colloid. The following data is obtained for preventing the coagulation of $10 \text{ mL}$ of gold sol to which $1 \text{ mL}$ of $10\% \text{ NaCl}$ is added. What is the gold number of $A$?

$1$. Expt. No.	$2$. Wt (in mg) of $A$ added to gold sol	$3$. Coagulation
$1$	$40$	Prevented
$2$	$35$	Prevented
$3$	$25$	Not prevented
$4$	$32$	Not prevented
$5$	$33$	Prevented

Using very little soap while washing clothes does not serve the purpose of cleaning clothes because ..... .

The zig-zag motion (erratic motion) of particles in a colloid was observed by:

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: