Which polymer is obtained from monomers using

Which from following elements belongs to the actinoids?

Which of the following rules states that it is impossible to determine simultaneously the exact position and exact momentum of an electron?

Calculate the cryoscopic constant of solvent when 2.5 gram solute is dissolved in 35 gram solvent lowers its freezing point by 3 K. (molar mass of solute is $117 \mathrm{~g} \mathrm{~mol}^{-1}$)