K for a zero order reaction is $2 \times 10^{- 2} L^{- 1} {S e c}^{- 1}$ . If the concentration of the reactant after 25 sec is 0.5 M, the initial concentration must have been.

0.5 M

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1.25 M

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12.5 M

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1.0 M

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Solution

The correct option is C 1.0 M
It is a Zero Order Reaction

$k = \frac{[A_{0}] - [A]}{t}$

$2 \times 10^{- 2} = \frac{[A_{0}] - [0.5]}{25}$

$[A_{0}] = 1 M$

Hence, the correct option is $D$

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