| Experiment | A in mol L ${ } ^ { - 1 }$ | B in mol L$^{-1}$ | Initial rate of reaction in $\mathrm { mol } \mathrm { L } ^ { - 1 } \mathrm {~min} ^ { - 1 }$ |
| I | 0.10 | 0.20 | $6.93 \times 10 ^ { - 3 }$ |
| II | 0.10 | 0.25 | $6.93 \times 10 ^ { - 3 }$ |
| III | 0.20 | 0.30 | $1.386 \times 10 ^ { - 2 }$ |
The following results were obtained during kinetic studies of the reaction.\\
$2 \mathrm {~A} + \mathrm { B } \rightarrow$ product
\begin{center}
\begin{tabular}{ l l l l }
Experiment & A in mol L ${ } ^ { - 1 }$ & B in mol L$^{-1}$ & Initial rate of reaction in $\mathrm { mol } \mathrm { L } ^ { - 1 } \mathrm {~min} ^ { - 1 }$ \\
I & 0.10 & 0.20 & $6.93 \times 10 ^ { - 3 }$ \\
II & 0.10 & 0.25 & $6.93 \times 10 ^ { - 3 }$ \\
III & 0.20 & 0.30 & $1.386 \times 10 ^ { - 2 }$ \\
\end{tabular}
\end{center}
The time (in minutes) required to consume half of A is\\
(1) 100\\
(2) 10\\
(3) 5\\
(4) 1