Rate constant of a first order reaction when 90% reacts in 30 minutes

1. A.
   $2.16\times10^{-2}\,\text{min}^{-1}$
2. B.
   $3.52\times10^{-2}\,\text{min}^{-1}$
3. C.
   $4.81\times10^{-2}\,\text{min}^{-1}$
4. D.
   $7.67\times10^{-2}\,\text{min}^{-1}$

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1. A.
   $7.7 \times 10^{-2}$ min$^{-1}$
2. B.
   $4.2 \times 10^{-2}$ min$^{-1}$
3. C.
   $2.1 \times 10^{-2}$ min$^{-1}$
4. D.
   $3.5 \times 10^{-2}$ min$^{-1}$

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