Question

For which of the following reaction $k_{310}/k_{300}$ would be maximum ?

• A. $P+Q\to R;E_a=10kJ$
• B. $E+F\to D;E_a=21kJ$
• C. $A+B\to C;E_a=10.5kJ$
• D. $L+M\to N;E_a=5kJ$

Answer 1

The correct option is B $E+F\to D;E_a=21kJ$

$k_{310}>k_{300}$, and $k\propto \frac{1}{E_a}$ and also $E_a\propto \frac{1}{T}$
But $E_a$ at $310K<E_a$ at $300K$
$\therefore k_{310}/k_{300}$ will be maximum for the reaction having high $E_a$
$E+F\to D;E_a=21kJ$