NEET Chemistry Chemical Kinetics Questions Solved


For the system A2g+B2g 2ABg,H=-160kJ If the activation energy for the forward step is 100 kcal/mol.What is the ratio of temperature at which the forward and backward reaction shows the same % change of rate constant per degree rise of temperature ? (1 cal= 4.2 J)

(A) 0.72                                                    

(B) 0.84

(C) 0.42                                                    

(D) 1

(B) Eaf-Eab=HEab=Eaf-H=420+80=500kJ/molNow, d In kfdT=EafR Tf2& d In kfdT=EabR Tb2 Eaf Tf2=Eab Tb2tftb=EafEab=420500=0.84

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