A) \[\text{ }0.18{}^\circ C\]
B) \[\text{ }0.54{}^\circ C~\]
C) \[\text{ }0.36{}^\circ C\]
D) \[\text{ }0.24{}^\circ C\]
Correct Answer: D
Solution :
| [d] Freezing point depression\[(\Delta {{T}_{f}})=i{{K}_{f}}m\] |
| \[\underset{\begin{smallmatrix} 1-\alpha \\ 1-0.3 \end{smallmatrix}}{\mathop{\text{HA}}}\,\xrightarrow[{}]{{}}\underset{\begin{smallmatrix} \alpha \\ 0.3 \end{smallmatrix}}{\mathop{{{\text{H}}^{\text{+}}}}}\,+\underset{\begin{smallmatrix} \alpha \\ 0.3 \end{smallmatrix}}{\mathop{{{\text{A}}^{-}}}}\,\] |
| \[i=1-0.3+0.3+0.3\] |
| \[i=1.3\] |
| \[\therefore \] \[\Delta {{T}_{f}}=1.3\times 1.86\times 0.1={{0.2418}^{o}}C\] |
| \[{{T}_{f}}=0-{{0.2418}^{o}}C\] |
| \[=-{{0.2418}^{o}}C\] |
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