5 g of Na_2 SO_4 was dissolved in x g of H_2 O. The change in freezing point was found to be 3.82°C. If Na_2

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Q 2701201128.     5 g of Na_2 SO_4 was dissolved in x g of H_2 O. The change in freezing point was found to be 3.82°C. If Na_2SO_4 is 81.5% ionised, the value of x (K_f for water = 1.86°C kg mol^(-1) is approximately : (molar mass of S = 32 g mol^(-1) and that of Na = 23 g mol^(-1) )

JEE 2017 Mains 8 April
A

15 g

B

45 g

C

25 g

D

65` g

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