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 If a reaction `A + B rarr C` is exothermic to the extent `30 kJ mol^(-1)` and the forward reaction has an activation energy of `249 kJ mol^(-1)` the activation energy for reverse reaction in `kJ mol^(-1)` isA. `324`B. `279`C. `40`D. `100`

A colliison between reactant molecules must occur with a certain minim

1.	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 If a reaction `A + B rarr C` is exothermic to the extent `30 kJ mol^(-1)` and the forward reaction has an activation energy of `249 kJ mol^(-1)` the activation energy for reverse reaction in `kJ mol^(-1)` isA. `324`B. `279`C. `40`D. `100`
Answer» Correct Answer - B `Delta H = E_(f)-E_(b)` `-30 = 249-E_(b)` `:. E_(b) = 249+30 = 279 kJ mol^(-1)`

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