The variation of rate constant with temperature can be explained by Arrhenius equation. However , the can be explained by Activation energy is found to be temperature dependent/In such cases`(d"in"K)/(dT)=(E_(a))/(RT^(2))` should be used to predict variation of rate constant with tempreature. On the basic of this information , answer the question that follow :
If for a reaction in `K=20-(20)/(T)+3` in T then `E_(a)` at 300 K will be

Options

A. 20 R
B. 900 R
C. 920 R
D. 880 R

Answer

C