Which of the following nanomaterials has all three dimensions $< 100 \text{ nm}$?

In which of the following is the Tyndall effect $NOT$ observed?

Which one of the following is a hydrophilic colloidal sol?

The coagulation of $200 \ mL$ of a positive colloid took place when $0.73 \ g$ of $HCl$ was added to it without changing the volume much. The flocculation value of $HCl$ for the colloid is

Which of the following is a multimolecular colloid?

Which experimental method and instrument are used to measure the colloidal properties of a polymer solution?