Rate constant of a first order reaction when 80% reacts (20% remains) in a given time

1. A.
   $0.11\text{ min}^{-1}$
2. B.
   $0.22\text{ min}^{-1}$
3. C.
   $0.34\text{ min}^{-1}$
4. D.
   $0.42\text{ min}^{-1}$

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1. A.
   $2.68 \times 10^{-2}\,\text{min}^{-1}$
2. B.
   $5.36 \times 10^{-2}\,\text{min}^{-1}$
3. C.
   $1.34 \times 10^{-2}\,\text{min}^{-1}$
4. D.
   $8.1 \times 10^{-2}\,\text{min}^{-1}$

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1. A.
   $1.609\ \mathrm{min^{-1}}$
2. B.
   $6.989\ \mathrm{min^{-1}}$
3. C.
   $16.09\ \mathrm{min^{-1}}$
4. D.
   $0.1609\ \mathrm{min^{-1}}$

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