NEET Chemistry Chemical Kinetics Questions Solved


If for a first order reaction, rate constant varies with temperature according to the graph given below. At 27°C1.5×10-4 percent of the reactant molecules are able to cross-over the potential barrier. At 52°C, the slope of this graph is equal to 0.2k-1 sec-1, calculate the value of rate constant at 52°C, assuming that activation energy does not change in this temperature range.

                                           

(A) 3.14 × 10-2 min-1                                       

(B) 1.35 × 10-2min-1

(C) 0.75 × 10-2min-1                                        

(D) 8.75 × 10-2 min-1

(D) 1.5×10-4×1100=e-Ea/RT=1.5×10-6=e-Ea/R×300Ea=33.43KJ mole-1;k=e-Ea/RTdkdT=EaRT2kk=0.2×8.314×325×32533.43×1000=8.75×10-2min-1

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