A commercial sample of cyclohexane freezes at

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Problem

6.0^\circ\text{C}

. If freezing point of cyclohexane is

6.5^\circ

and

K_f = 200 \text{ K molality}^{-1}

, then purity of sample is : (1) 99.8% (2) 98% (3) 90.9% (4) 99.5%