A) 11%
B) 20%
C) 80%
D) 89%
Correct Answer: C
Solution :
Specific rotation of sugar solution is angle of rotation \[\text{ }\!\!\alpha\!\!\text{ }\,\text{=}\,\frac{\text{angle}\,\text{of}\,\text{rotation}}{\text{length of tube }\!\!\times\!\!\text{ concentration}}\] \[\,\text{=}\,\frac{\theta }{\text{l }\!\!\times\!\!\text{ C}}\] \[\therefore \]\[C\,\text{=}\,\frac{\theta }{\text{l}\,\alpha }\] \[\,\text{=}\,\frac{0.4}{0.25\times 0.01}\] \[=160kg/{{m}^{3}}\] Thus, purity of sugar solution \[=\frac{160}{200}\times 100=80%\]
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