Q.
Specific rotation of sugar solution is 0.01 SI units. 200 kgm−3 of impure sugar solution is taken in a polarimeter tube of length 0.25 m and an optical rotation of 0.4 rad is observed. The percentage of purity of sugar is the sample is
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a
80%
b
89%
c
11%
d
20%
answer is A.
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Detailed Solution
Specific rotation(α)=θlc⇒c=θαl=0.40.01×0.25=160kg/m3Now percentage purity of sugar solution=160200×100=80%
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