$\mathrm{.}2.$ The sample separation methods have its advantages and limitations$,$ and the choice of equipment depends on factors such as the size, composition, and properties of the nanoparticles being separated. Give five techniques and a brief explanation of how the separation will take place, which can be used to separate silver nanoparticles $($Ag$-$NPs$)$ from a solution, especially if you're dealing with a small amount like $1$ gram.

$(10)$

$[20$ MARKS$]$