A colliison between reactant molecules must occur with a certain minimum energy before it is effective in yielding Product molecules. This minimum energy is called activation energy `E_(a)` Large the value of activation energy, smaller the value of rate constant `k`. Larger is the value of activation energy, greater is the effect of temperature rise on rate constant `k`.

`E_(f) =` Activation energy of forward reaction
`E_(b) =` Activation energy of backward reaction
`Delta H = E_(f) - E_(b)`
`E_(f) =` threshold energy
The activation eneries for forward and backward reactions in a chemical reaction are `30.5` and `45.4 kJ mol^(-1)` respectively. The reaction is

Options

A. exothermic
B. endothermic
C. neithter exothermic nor endothermic
D. idenpendent of temperature

Answer

A