A) 50
B) 40
C) 30
D) 20
Correct Answer: B
Solution :
\[\Delta {{T}_{b}}i\,\,{{K}_{b}}.m\] |
Given molality \[=\frac{1\times 1000}{250}=4m,\] |
\[6.4=i\times 2\times 4\,\,or\,\,i=0.8\] |
For dimerization |
\[i=1-\frac{\beta }{2}\] |
\[\Rightarrow 0.8-1=\frac{-\,\beta }{2}\] |
Or \[\beta =0.4\] |
\[\Rightarrow 40%\] |
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