Q 1210091819.     An element `X` of atomic mass `25.0` exists as `X_4` in benzene to the extent of `100%`. When `10.30` g of saturated solution of `X` in benzene is added to `20.0` g of benzene, the depression in freezing point of the resulting solution is `0.51` `K.` If `K_f` for benzene is ` 5.1 K` `kg mol^(–1)`, find the solubility of `X` in `100` g of benzene.

A

`0.7` g

B

`0.3` g

C

`2.9` g

D

`3.0` g

HINT

Use formula: `ΔT_f = (1000K_f W_text(solute))/(M_text(solute)×W_text(solvent))`

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