The rate constant for a zero order reaction is $2 \times 10^{-2} \ mol \ L^{-1} s^{-1}$. If the concentration of the reactant after $25 \ s$ is $0.5 \ M$,the initial concentration must have been $:-$ (in $M$)

  • A
    $0.5$
  • B
    $1.25$
  • C
    $12.5$
  • D
    $1.0$

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