Q.

The polarimeter readings in an experiment to measure the rate of inversion of cane sugar (1st order) were as follows :

Time(min)030
Rotation due to solution60°40°-30°

Which of the following is correct?

 log 2=0.3, log 3=0.48, log 7=0.84, loge 10=2.3

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a

The half life of reaction is 30 min.

b

The solution becomes optically inactive at 120 min.

c

Rotation after 40 sec. and after 80 sec will be in the opposite direction.

d

The time taken for 14 th of sucrose to invert will 4 be 150 min.

answer is B.

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Detailed Solution

Here,

k×30=ln 60+3040+30n=5 k=9.2×103

At,  rt=0;

 9.2×103×t=ln9030 t=120 min

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