If the dispersed phase is liquid and the dispersion medium is solid,the colloid is known as:

Flocculation value of $BaCl_2$ is much less than that of $KCl$ for sol $A$ and flocculation value of $Na_2SO_4$ is much less than that of $NaBr$ for sol $B.$ The correct statement among the following is

Point out the false statement.

The most suitable electrolyte for the coagulation of arsenic sulphide sol will be

Alum helps in purifying water by

All colloidal dispersions have