The macromolecular colloids among the following are:
$I$. Starch solution
$II$. Sulphur sol
$III$. Synthetic detergent
$IV$. Synthetic rubber

The coagulation of $100 \, mL$ of a colloidal sol of gold is completely prevented by the addition of $0.25 \, g$ of a substance '$X$' to it before adding $10 \, mL$ of $1 \% \ NaCl$ solution. The gold number of '$X$' is:

For $As_2S_3$ sol,the most effective coagulating agent is

Which ion has the lowest coagulating power?

In a colloidal solution,both the dispersed phase and dispersion medium are in liquid phase. What is the type of colloid?

If $1000 \ mg$ of a lyophilic colloid prevents the coagulation of $100 \ mL$ of a lyophobic sol,then the gold number (protective value) is ......... $mg$.