From Arrhenius law, a plot of loge K versus 1/T gives a straight line with a slope of (-E/R). The unit of E/R is___________________?

Related Mcqs:

1. Consider the ‘n’ th order irreversible liquid phase reaction A → B. Which one of the following plots involving half life of the reaction (t1/2) and the initial reactant concentration (CA0) gives a straight line plot ?

   A. CA0 Vs t1/2
   B. ln CA0 Vs t1/2
   C. CA0 Vs ln t1/2
   D. ln CA0 Vs ln t1/2

2. The temperature dependence of reaction rate constant (K) by Arrhenius law is given by_______________?

   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

3. 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

4. The unit of frequency factor in Arrhenius equation is_______________?

   A. Same as that of rate constant
   B. Same as that of activation energy
   C. Dimensionless
   D. None of these

5. Arrhenius equation shows the variation of ___________________ with temperature?

   A. Reaction rate
   B. Rate constant
   C. Energy of activation
   D. Frequency factor

6. With increase in temperature, the rate constant obeying Arrhenius equation____________________?

   A. Increases
   B. Decreases
   C. Decreases exponentially
   D. Can either increase or decrease; depends on the frequency factor

7. Arrhenius equation represents graphically the variation between the ______________ and temperature?

   A. Rate of reaction
   B. Frequency factor
   C. Rate constant
   D. Activation energy

8. According to Arrhenius equation of temperature dependency of rate constant for an elementary reaction _________________?

   A. k ∝ √T
   B. k ∝ e-E/RT
   C. k ∝ T e-E/RT
   D. None of these

9. The units of frequency factor in Arrhenius equation_________________?

   A. Are the same as those of the rate constant
   B. Depend on the order of the reaction
   C. Depend on temperature, pressure etc. of the reaction
   D. Are cycles per unit time

10. The conversion XA and residence time data are collected for zero order liquid phase reaction in a stirred tank reactor. Which of the following will be a straight line ?

    A. XA Vs . η
    B. XA Vs ln η
    C. XA/(1 – XA)Vs η
    D. XA(1 – XA)Vs η