Identify linear polymer from the following.

What is the conductivity of $$0.05 ~\mathrm{M} ~\mathrm{BaCl}_2$$ solution if its molar conductivity is $$220 ~\Omega^{-1} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$$ ?

Which from following polymers is grouped in the category of elastomers?

Which element from following exhibits diagonal relationship with beryllium?