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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/m3

Now percentage purity of sugar solution

=160200×100=80%

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