Backmixing is most predominant in___________________?

Related Mcqs:

1. The value of ‘n’ for a chemical reaction A → B, whose reaction rate is → CA n, will be _______________ if the rate of the reaction increases by a factor of 8, when the concentration of is doubled?

   A. 0
   B. 1
   C. 2
   D. 3

2. The following gas phase reaction is taking place in a plug flow reactor. A stoichiometric mixture of A and B at 300 K is fed to the reactor. At 1 m along the length of the reactor, the temperature is 360 K. The pressure drop is negligible and an ideal gas behaviour can be assumed. Identify the correct expression relating the concentration of A at the inlet (CA0), concentration of A at 1m (CA) and the corresponding conversion of A (X) ?

   A. CA = 1.2 CA0 (1 – X)/(1 – 0.33X)
   B. CA = 1.2 CA0 (1 – X)/(1 – 0.5X)
   C. CA = 0.83 CA0 (1 – X)/(1 – 0.33X)
   D. CA = 0.83 CA0 (1 – X)/(1 – 0.5X)

3. Pick out the correct statement ?

   A. A chemical reaction accompanied by absorption of heat is called an exothermic reaction
   B. A chemical reaction accompanied by evolution of heat is called an endothermic reaction
   C. The rate constant for a first order reaction does not change on changing the concentration units
   D. Chemical equilibrium state is dynamic in nature

4. For an ideal mixed flow reactor (CSTR), the exit age distribution E(t) is given by __________________?

   A. A Dirac delta function
   B. A step function
   C. A ramp function
   D. None of the above

5. The effectiveness factor for large value of Thiele modulus [L√(K/D1)] of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm2/second) ?

   A. L √(K/D1)
   B. 1/[L√(K/D1)]
   C. 1
   D. ∞

6. Rate of a chemical reaction is independent of the concentration of the reactants for a _________________ reaction?

   A. Zero order
   B. Third order
   C. Consecutive
   D. None of these

7. For a tubular flow reactor with uniform concentration and temperature, the independent variable is___________________?

   A. Time
   B. Length
   C. Diameter
   D. None of these

8. Velocity of a chemical reaction___________________?

   A. Decreases with increase in temperature
   B. Increases with increase of pressure of reactants for all reactions
   C. Decreases with increase of reactant concentration
   D. None of these

9. What is the order of chemical reaction as shown in the bellow figure, if it is found that the reaction rate doubles on doubling the concentration of B and also the reaction rate doubles when the concentrations of both A & B were doubled and quadrupled when the concentrations of both B & C were doubled ?

   A. 1
   B. 2
   C. 3
   D. 4

10. In a consecutive reaction system of the given figure bellow, when E1 is much greater than E2, the yield of B increases with the____________________?

    A. Increase of temperature
    B. Decrease of temperature
    C. Increase in initial concentration of A
    D. Decrease in initial concentration of A