The charge of $SnO_2$-sol in alkaline and acidic medium are respectively (Hint: $SnO_2$ is amphoteric oxide).

In the case of small cuts,bleeding is stopped by applying potash alum. Here alum acts as

Which of the following statements is true for a lyophilic sol?

Give an example of a solid sol in which the dispersed phase is in a gaseous state.

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:

During electrosmosis of $Fe(OH)_3$ sol,