Which among the following is NOT colligative property?

What is the molality of solution of a non-volatile solute having boiling point elevation $$7.15 \mathrm{~K}$$ and molal elevation constant $$2.75 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$$ ?

Which among the following salts exhibits inverse relation between it's solubility and temperature?

If $$0.01 \mathrm{~m}$$ aqueous solution of an electrolyte freezes at $$-0.056 \mathrm{~K}$$. Calculate van't Hoff factor for an electrolyte (cryoscopic constant of water $$=1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$$ )