JEE Advanced 2020 Concept Recapitulation Test 4 Paper 2

A solution is prepared by dissolving 1.5g of a monoacidic base into 1.5kg of water at 300K, which showed a depression in freezing point by 0.165∘C. When 0.496g of the same base titrated, after dissolution, requires 40ml of semimolar H2SO4 solution. If Kf of water is 1.86K kgmol−1, then select the correct statement(s) out of the following (assuming molarity = molality):