Identify the correct statement regarding lyophilic colloids from the following.

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

Which among the following is a zero-dimensional nanostructure?

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

In the preparation of ice cream,gelatin is often added as an ingredient for:

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