`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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Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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