Who is associated with the 'Index of protective power of colloids' in the material?

• A. Zsigmondy
• B. Nuggets
• C. Dolomite
• D. None of the above

Answer: (A)

The idea being tested is how we measure how well a protective colloid can shield dispersed particles from coming together when electrolytes are present. The index of protective power is a way to quantify that shielding: a higher index means the colloid is more effective at preventing coagulation, keeping the suspension stable.

Zsigmondy is the figure associated with this concept. He studied protective colloids and their ability to stabilize sols, introducing this kind of index to compare how strong the protective effect is for different colloids. The other options don’t relate to this measurement in colloid chemistry, so they don’t fit.

So, the correct association is the scientist who developed and used this index to gauge protective power.