A) \[-{{1.86}^{o}}C\]
B) \[-{{3.72}^{o}}C\]
C) \[+{{1.86}^{o}}C\]
D) \[+{{3.72}^{o}}C\]
Correct Answer: B
Solution :
For \[NaCl\] \[i=2\] \[\Delta {{T}_{f}}=2{{K}_{f}}m=2\times 1.86\times 1=3.72\] \[{{T}_{s}}=T-\Delta {{T}_{f}}=0-3.72=-3.72{}^\circ C\]
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