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In the following first order reactions (...

In the following first order reactions `(A)overset(k_(1))rarr"product",(B)overset(k_(2))rarr"product"`, the ratio `k_(1)//k_(2)` if `90%` of (A) has been reacted in time 't' while `99%` of (B) has been reacted in time 2t is :

A

1

B

2

C

`1//2`

D

none of these

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A
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