Emulsifiers are generally .......

Albumin has a gold number of $0.09$. What is the minimum amount of albumin (in $mg$) required to protect the coagulation of $40 \ mL$ of gold sol from $4 \ mL$ of $10 \% \ NaCl$ solution?

Which one of the following is not a surfactant?

The mass of Haemoglobin in $mg$ required to protect from coagulation of $50 \ mL$ of a gold sol on adding $5 \ mL$ of $10 \% NaCl$ solution is: (Gold number of Haemoglobin $= 0.03$)

An example of a solid sol is

Which of the following forms cationic micelles above a certain concentration?