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The rate constant data of the following ...

The rate constant data of the following reactions are as given below;
1.aA `->` products, k=a `mol^-1` L `min^-1`
2.bB `->` products, k=b `min^-1`
The half lives of the both the reactions are the same and equal to 1 hour when molar concentration of reactant is equal to 1.0 mol `L^-` in each case. If these reactions are carried out simultaneously taking 1M of the reactant in each case. The ratio [A]/[B] after a lapse of 3 hours will be
A) 2
B) 0.5
C) 4
D) 1

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