53. The rate constant of a reaction at temperature 200K is 10 times less than the rate constant at 400 K. What is the activation energy (Ea ) of the reaction (R = gas constant)
(a) 1842.4 R              (b) 921.2 R             (c) 460.6 R                (d) 230.3 R

54. In respect of the equation K = A e - E a / R T in chemical kinetics, which one of the following statement is correct

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