If the molecular weight of a compound is increased,then the sensitivity is decreased in which of the following methods?

Which one of the following sols acts as a lyophilic colloid?

Arsenic sulfide is a negatively charged sol. Which of the following reagents has the lowest coagulating power for it?

For which $ \text{lyophilic} $ sol is the $ \text{Gold Number} $ the highest?

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: Dissolved substances can be removed from a colloidal solution by diffusion through a parchment paper.
Reason $(R)$: Particles in a true solution cannot pass through parchment paper but the colloidal particles can pass through the parchment paper.
In the light of the above statements,choose the correct answer from the options given below.

What is the ratio of the volume of a colloidal particle $(V_c)$ to the volume of a particle in a true solution $(V_s)$?