C 6 H 6 freezes at 5 . 5 ° C . The temperature at which a solution of 10   g of C 4 H 10 in 200…

C6H6 freezes at 5.5°C. The temperature at which a solution of 10 g of C4H10 in 200 g of C6H6 freeze is _______C∘. (nearest integer value), (The molal freezing point depression constant of C6H6 is 5.12°C/m.)

Solution

Pure Solvent: C6H6ℓ

Given: Tf°=5.5°C

Kf=5.12°C/m

:Solute is non dissociative

∵  ΔTf=kf×m

⇒Tf0-Tf'=5.12×10582001000kgmol

⇒5.5-Tf'=5.12×5×1058

⇒Tf'=1.086°C≃1C∘

Asked in: JEE Main 2021 (24 Feb Shift 2)

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