Q. For a chemical reaction, the ratio of rate constant at 500 K to that at 400 K is 2.5. Given R = 8.314 J mol-1 K-1, the value of activation energy (in kJ/mol) is
(A) 10.5 (B) 12.0 (C) 15.2 (D) 18.4
Ans: 15.2
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