Question

For a reaction, $E_a=0$ and $K=4.2\times {10}^5{sec}^{-1}$ at $300K$, the value of $K$ at $310K$ will be:

• A. $4.2\times {10}^5{sec}^{-1}$
• B. $8.4\times {10}^5{sec}^{-1}$
• C. $8.4\times {10}^{-5}{sec}^{-1}$
• D. $4.2\times {10}^{-5}{sec}^{-1}$

Answer 1

The correct option is A $4.2\times {10}^5{sec}^{-1}$

For any reaction, rate constant $K$ can be written as $K=A.e^{-\frac{E_a}{RT}}$

As, $E_a=0$, therefore, $K$ will be independent on temperature as $e^{-\frac{E_a}{RT}}=1$

Hence, the rate constant will be the same at 310 K as that of at 300 K.