A) \[k\text{/}a\]
B) \[a\text{/}2k\]
C) \[a\text{/}k\]
D) \[2k\text{/}a\]
E) \[ka\]
Correct Answer: C
Solution :
For zero order reaction : \[A\xrightarrow{{}}\]Product \[\begin{align} & \begin{matrix} a & \,\,\,\,\,\,\,\,\,0 & \text{at}\,\text{time}=0 \\ \end{matrix} \\ & \begin{matrix} a-x & x & \text{at}\,\text{time}=t \\ \end{matrix} \\ \end{align}\] Rate constant (k) is given as \[k=\frac{x}{t}\] After completion of the reaction, the all initial concentration a is changed into x, then x = a \[\therefore \] \[k=\frac{a}{t}\] \[t=\frac{a}{k}\]
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