A) \[{{0}^{o}}C\]
B) \[-{{1.86}^{o}}C\]
C) \[{{1.86}^{o}}C\]
D) None of the above
Correct Answer: B
Solution :
\[\Delta {{T}_{b}}={{K}_{b}}\times m\] i.e. \[0.52=0.52\times m\] \[\Delta {{T}_{f}}={{K}_{f}}\times m=1.86\times 1=1.86\]; \[{{T}_{f}}=-{{1.86}^{o}}C\].
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