For a certain reaction $A \to P$ , the half life for different initial concentration of $A$ is mentioned below 

$[A_0]$  $||$  $0.1$  $||$  $0.025$

$t_{1/2}(s)$  $||$ $100$  $||$  $50$

Which of the following option $(s)$ is / are correct

  • A

    The order is $1$

  • B

    The order is $2$

  • C

    For $\left[ {{A_0}} \right] = 1\,M,\,\,\,{t_{1/2}} = 100\sqrt {10} \,\sec $

  • D

    unit of $k$ is $M/Sec$

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