A. K α e-E/RT
B. K α eE/RT
C. K α T . e-E/RT
D. K α √T . e-E/RT
Related Mcqs:
- The rate constant of a chemical reaction increases by 100 times when the temperature is increased from 400 °K to 500 °K. Assuming transition state theory is valid, the value of „E/R’ is __________________?
A. 8987°K
B. 9210°K
C. 8764°K
D. 8621°K - At a given value of E/R (ratio of activation energy and gas constant), the ratio of the rate constants at 500°K and 400°K is 2, if Arrhenius law is used. What will be this ratio, if transition state theory is used with the same value of „E/R‟ ?
A. 1.6
B. 2
C. 2.24
D. 2.5 - Collision theory gives the rate constant for bimolecular reaction as___________________?
A. K α √T.e-E/RT
B. K α eE/RT
C. K α e-E/RT
D. None of these - The rate controlling step for the heterogeneous irreversible catalytic reaction A(g) + B(g) → C(g) is the surface reaction of absorbed A with absorbed B to give adsorbed C. The rate expression for this reaction can then be written as (where, KA, KB and KC are the equilibrium constants and is the rate constant of the rate controlling step) ?
A. k KA pApB / (1 + KApA + KBpB)
B. k KAKB pApB / (1 + KApA + KBpB)
C. k KAKB pApB / (1 + KApA + KBpB + KCpC)
D. k KAKB pApB / (1 + KApA + KBpB + KCpC)2 - A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by________________?
A. keff = k + kg
B. keff = (k+ kg)/2
C. keff = (kkg)1/2
D. 1/keff = 1/k + 1/kg - For identical flow rate, feed composition and for elementary first order reactions, ‘N’ equal sized mixed reactors in series with a total volume ‘V’ gives the same conversion as a single plug flow reactor of volume ‘V’ for constant density systems. This is true, when the value of ‘N’ is ___________________?
A. 1
B. > 1
C. ∞
D. ≥ 1 - Transition state theory relates the above quantities as___________________?
A. k ∝ e-E/RT
B. k ∝ T.eE/RT
C. k ∝ √T
D. k ∝ T1.5 - Rate constant ‘k’ and absolute temperature ‘T’ are related by collision theory (for bimolecular) as______________________?
A. k ∝ T1.5
B. k ∝ exp(-E/RT)
C. k ∝ √T
D. k ∝ T - From collision theory, the reaction rate constant is proportional to_________________?
A. exp (-E/RT)
B. exp (-E/2RT)
C. √T
D. Tm exp (-E/RT) - Rate of a gaseous phase reaction is given by the reaction shown in the bellow figure. The unit of rate constant is__________________?
A. (atm)-1
B. (hr)-1
C. (atm)-1.(hr)-1
D. atm.(hr)-1
