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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Chemistry (CY)
Folowing are the values of e, and ah for three reactons carmed out at the same tenypera :e-20 k mol, ah--60 kj mo ii:e-10k mo, ah-20kj mol i: e=40 ki mol,ah=+15
Folowing are the values of E, and AH for three reactons carmed out at the same tenypera :E-20 k mol, AH--60 kJ mo II:E-10k mo, AH-20kJ mol I: E=40 ki mol,AH=+15 kJ mo 84 lf all the three reaction have same frequency factor then tastest and slowest reacthons are Fastest Slowest (a) I (b) II II (c) I (d) can't be predicted.
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Priyanshu kumar Best Answer
Since delta H is a thermodynamic parameter ,not a kinetic parameter. So it has no role in deciding the rate of reaction. Now,from Arrhenius equation we can see that rate constant has inverse relation with activation energy. Means lower the activation energy, greater is the rate of reaction and vice versa. II has lowest activation energy i.e 10 kj/mol. So it is fastest. III has largest activation energy i.e 40 kj/mol. So it is slowest. option B is correct