The $Purple \ of \ Cassius$ is $......$.

An example of a solid sol is

In emulsions,the dispersion medium and dispersed phase are

Zeta potential is

When $FeCl_3$ is added to an excess of hot water,it gives a sol '$X$'. When $FeCl_3$ is added to $NaOH_{(aq)}$ solution,it gives a sol '$Y$'. The sols '$X$' and '$Y$' formed in the above processes respectively are:

Which among the following is an example of an emulsion?