Question

The time required for $100\%$ completion of a zero order reaction is (a is the initial concentration and k is the rate constant)

• A. $\frac{2k}{a}$
• B. $\frac{a}{2k}$
• C. $\frac{a}{k}$
• D. $ak$

Answer 1

The correct option is C $\frac{a}{k}$

For a zero order reaction,

$kt=\left[A_0\right]-\left[A\right]$

As the reaction is 100 percent complete, the final concentration of the reactants is zero.

$\therefore \left[A\right]=0$.

Given, initial concentration is $[A{]}_0=a$.

$\therefore kt=a-0$

$t=\frac{a}{k}$