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Question

The normal freezing point of nitrobenzene is 278.82 K. A non-volatile solute is dissolved in it and a solution of molality 0.25 m is prepared. If the observed freezing point of the solution is 276.82 K, the value for Kf of nitrobenzene is

Options

A.6 K-kg mol−1
B.8 K-kg mol−1
C.7 K-kg mol−1
D.5 K-kg mol−1

Solution

$\Delta T_{f} = K_{f}.m \Rightarrow 2.0 = K_{f} \times 0.25 \Rightarrow K_{f} = 8\text{K/m}$

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