Which of the following can stabilize gold sol from coagulation by $NaCl$ solution?

Lyophilic sols are more stable than lyophobic sols because:

The disperse phase in colloidal iron $(III)$ hydroxide and colloidal gold is positively and negatively charged,respectively. Which of the following statements is $NOT$ correct?

Which among the following is an example of an emulsion?

Coagulating value of electrolytes $AlCl_3$ and $NaCl$ for $As_2S_3$ are $0.09$ and $50.04$ respectively. The coagulating power of $AlCl_3$ is $x$ times the coagulating power of $NaCl$. The value of $x$ is $.......$.

What is the potential difference between the fixed layer and the diffused layer of opposite charges called?