A) \[{{S}_{2}}\]
B) \[{{S}_{6}}\]
C) \[{{S}_{8}}\]
D) \[{{S}_{12}}\]
Correct Answer: C
Solution :
\[\Delta {{T}_{f}}=\frac{1000{{K}_{f}}{{w}_{2}}}{{{M}_{2}}\times {{w}_{1}}}=\frac{1000\times 5.12\times 25.6}{{{M}_{2}}\times 100}=5.12\] \[{{M}_{2}}=\frac{1000\times 5.12\times 25.6}{5.12\times 100}=256\,gmo{{l}^{-1}}\] But atomic mass of sulphur\[=32\,g\,mo{{l}^{-1}}\] If molecular formula is\[{{S}_{x}}\]then, \[32x=256\] \[x=8\] Hence, sulphur exists as 83 in benzene.
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