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Two substances A(T((1)/(2))=10" min") & ...

Two substances `A(T_((1)/(2))=10" min") & B (T_((1)/(2))="20 min")`follow I order kinetics in such a way that `[A]_(i)=8[B]_(j)`. Time when `[B] = 2[A]` in min is :

A

20

B

40

C

60

D

80

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The correct Answer is:
D
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