A) \[-{{6.54}^{o}}C\]
B) \[{{6.54}^{o}}C\]
C) \[-{{0.654}^{o}}C\]
D) \[{{0.654}^{o}}C\]
Correct Answer: C
Solution :
\[\frac{\Delta {{\Tau }_{b}}}{\Delta {{T}_{f}}}=\frac{{{K}_{b}}}{{{K}_{f}}}\] \[\therefore \] \[\Delta {{\Tau }_{f}}=\frac{{{K}_{f}}}{{{K}_{b}}}\times \Delta {{T}_{b}}=\frac{1.86}{0.512}\times 0.18=0.654\] \[\therefore \]\[f.pt.=0-0.654=-0.654{{\,}^{o}}C\]
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