Question

The time required to complete one half of a reaction varies inversely to the concentration of the reactant. The order of such reactions is:

• A. 0
• B. 1
• C. 2
• D. 3

Answer 1

Answer: (C)

2

For a second order reaction,

$t_{1/2}=\frac{1}{k\left[A_0\right]}$

Thus, for second order reaction, time required to complete a half fraction of a reaction varies inversely to the initial concentration of reactant.