A) \[{{S}_{6}}\]
B) \[{{S}_{7}}\]
C) \[{{S}_{8}}\]
D) \[{{S}_{9}}\]
Correct Answer: A
Solution :
Given, mass of solvent (w) = 100 g Depression in freezing point\[(\Delta {{T}_{f}})=0.84{}^\circ C\] \[{{k}_{f}}=7.0\] \[\frac{Mass\text{ }of\text{ }solute\,(w)}{molecular\text{ }mass\text{ }of\text{ }solute\,(M)}=0.072\] \[\Delta {{T}_{f}}=\frac{1000\times {{k}_{f}}}{n\times w}\left( \frac{w}{M} \right)\] \[0.84=\frac{1000\times 7.0\times 0.072}{n\times 100}\] \[n=6\] \[\therefore \]S is in\[{{S}_{6}}\]form in solution.
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