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The rate constant of a zero order reaction is $2.0 \times 10^{- 2} {molL}^{- 1} s^{- 1} .$ If the concentration of the reactant after 25 seconds is 0.5 M. What would be the initial concentration?

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0.5 M

1.25 M

12.5 M

1.0 M

answer is D.

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Detailed Solution

For a zero order reaction,
$\begin{array}{l} [A] = [A_{0}] - k . t \\ \Rightarrow 0.5 = [A_{0}] - 2 \times 10^{- 2} \times 25 \\ \Rightarrow [A_{0}] = 1 M \end{array}$

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