NEET Chemistry Chemical Kinetics Questions Solved


The rate constant of a certain first order reaction increases by 11.11% per degree rise of temperature at 27°C. By what % will it increase at 127o C, assuming constancy of activa-
tion energy over the given temperature range ?

(A) 5.26%                                             

(B) 5.62%

(C) 6.25%                                             

(D) 7.33%

(C) dlnKdT=EaRT2dKK=EaRT2dTdKK=11.11100; dT=1°C; T=27°C=300 K0.1111=Ea1.987×300×300 Ea=0.1111×1.987×3002At 127°CdKK=Ea1.987×40020.1111×1.987×30021.987×4002=0.1111×342=0.06249%change=6.25

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