Question

Which is not true for a second order reaction ?

• A. It can have rate constant $1\times {10}^{-2}$ $Lmo{l}^{-1}{s}^{-1}$
• B. Its half - life is inversely propotional to its initial concentration
• C. Time to compelete $75$ reaction is twice of half - life
• D. $T_{50}$ = $\frac{1}{K\times Initialconc.}$

Answer 1

Answer: (C)

Time to compelete $75$ reaction is twice of half - life

Unit of Rate Constant for a second order reaction is ${mol}^{-1}L{s}^{-1}$.

$t_{1/2}\alpha a^{1-n}$. Here n =2

$t_{1/2}\alpha a^{-1}$. So Its Inversely Proportional to Half Life.

$t_{1/2}$ = $\frac{1}{ak}$ where a is initial concentration

TIme to complete 75% reaction is twice to half life is false. Its is true for 1st Order Reaction