An optically active substance, A, decomposes into optically active substances ' B ' and 'C' as: A \stackrel{K-0.001 \min ^{-1}{───────▸}} 2 B+C The specific rotations of {A}, {B} and {C} are +40^\circ,+10^\circ and -30^\circ per mole, respectively. If initially {A} and {C} were present in 4: 3 mole ratio, the time (in min), after which the sample becomes optically inactive, is (\ln 2=0.7, \ln 5=1.6, \ln 7=2.0, \ln 13=2.5)

JEE Advanced 2021 Full Test 1 Paper 2

SECTION – C (Numerical Answer Type)
This section contains 06 questions. The answer to each question is a NUMERICAL VALUE. For each question, enter the correct numerical value (in decimal notation, truncated/rounded-off to the SECOND DECIMAL PLACE; e.g. XXXXX. XX).

Question : 31 of 54

Marks: +1, -0

An optically active substance, A, decomposes into optically active substances ' B ' and 'C' as:
A

K−0.001min−1

───────▸

2B+C
The specific rotations of A,B and C are +40°,+10° and −30° per mole, respectively. If initially A and C were present in 4:3 mole ratio, the time (in min), after which the sample becomes optically inactive, is (ln‌2=0.7,ln‌5=1.6,ln‌7=2.0,ln‌13=2.5)

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