5 g of Na2SO4 was dissolved in x g of H2O. The change in freezing point was found to be 3.820C. If Na2SO4 is 81.5% ionised, the value of x (K for water=1.860C kg mol−1) is approximately : (molar mass of S=32 g mol−1 and that of Na=23 g mol−1)
Option: 1 15 g
Option: 2 25 g
Option: 3 45 g
Option: 4 65 g
Study 40% syllabus and score up to 100% marks in JEE