Lyophilic sols are more stable than lyophobic sols because their particles are

Which one of the following is a lyophilic colloid?

Given below are two statements,one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$ : The diameter of colloidal particles in solution should not be much smaller than the wavelength of light to show Tyndall effect.
Reason $R$ : The light scatters in all directions when the size of particles is large enough.
In the light of the above statements,choose the correct answer from the options given below:

Which of the following ions has greater coagulating power for a negatively charged sol?

Colloidal particles carry a charge. This is demonstrated by ........

The Brownian movement exhibited by colloidal particles is a ....... property.