Specific rotation of sugar solution is \( 0.01 \) SI units. \( 200 \mathrm{kgm}^{-3} \) of impur...

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Specific rotation of sugar solution is \( 0.01 \) SI units. \( 200 \mathrm{kgm}^{-3} \) of impure sugar solution is taken in a polarimeter tube of length \( 0.25 \mathrm{~m} \) and an optical rotation of \( 0.4 \) rad is observed. The percentage of purity of sugar is the sample is
(A) \( 80 \% \)
(B) \( 11 \% \)
(C) \( 89 \% \)
(D) \( 20 \% \)
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