NEET Chemistry Chemical Kinetics Questions Solved

NEET - 2015

The activation energy of a reaction can be determined from the slope of which of the following graphs?

(a) In K vs T

(b) In K/T vs T

(c) In K vs 1/T

(d) T/In K vs 1/T

 

By arrhenius equation K = Ae-Ea/RT

where, Ea = energy of activation 

Applying log on both the side, 

in K = inA - Ea/RT   ...(i)

or log k= - Ea/2303RT + logA   ....(ii)

This equation is of the form of y = mx+c i.e. the equation of a straight line. Thus, if a plot of log k vs 1/T is a straight line, the validity of the equation is confirmed. 

Slope of the line = Ea/2.303R

Thus measuring the slope of the line, the value of Ecan be calculated .

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