A substance reacts with initial concentration of $a$ $m o l$ ${d m}^{- 3}$ according to zero order kinetics. The time it takes for the completion of the reaction is: ( $k =$ rate constant)

\frac{k}{a}

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\frac{a}{2 k}

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\frac{a}{k}

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\frac{2 k}{a}

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Solution

The correct option is C $\frac{a}{k}$
Since rate constant of zero order reaction is $[A] = [A]_{o} - k t$
$⟹ t = \frac{[A]_{o} - [A]}{k}$
$⟹ t = \frac{a - 0}{k}$
$⟹ t = \frac{a}{k}$

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A substance reacts with initial concentration of a mol dm−3 according to zero order kinetics. The time it takes for the completion of the reaction is: (k= rate constant)

The correct option is C akSince rate constant of zero order reaction is [A]=[A]o−kt ⟹t=[A]o−[A]k ⟹t=a−0k ⟹t=ak

A substance reacts with initial concentration of $a$ $m o l$ ${d m}^{- 3}$ according to zero order kinetics. The time it takes for the completion of the reaction is: ( $k =$ rate constant)

The correct option is C $\frac{a}{k}$
Since rate constant of zero order reaction is $[A] = [A]_{o} - k t$
$⟹ t = \frac{[A]_{o} - [A]}{k}$
$⟹ t = \frac{a - 0}{k}$
$⟹ t = \frac{a}{k}$