A. Hydrogenation of oils
B. Gas phase oxidation of SO2 in chamber process
C. Alkylation of hydrocarbons
D. None of these
Related Mcqs:
- In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO2 to SO3 is accomplished by a ______________ reaction ?
A. Non-catalytic homogeneous
B. Non-catalytic heterogeneous
C. Catalytic homogenous
D. Catalytic heterogeneous - Effectiveness factor E. of a catalyst pellet is defined as, E = (actual rate within pore of the catalyst)/(rate if not snowed by pore diffusion), Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus) ___________________?
A. tan hT/T
B. tan T/T
C. tan hT/tan T
D. None of these - A catalyst is said to be a negative catalyst, if it ___________________?
A. Retards the rate of reaction
B. Reduces the value of equilibrium constant
C. Does not initiate the reaction
D. All A., B. and C. - A spherical porous catalyst particle of radius R is subjected to reactant A which reacts to form B by a zero order surface reaction A → B. Film mass transfer resistance is negligible and pore diffusion of A is rate controlling. The effectiveness factor of the catalyst is reported as 7/8. Which of the following statement is true?
A. Inner catalyst core of radius R/8 does not participate in reaction
B. Inner catalyst core of radius R/2 does not participate in reaction
C. Inner catalyst core of radius 7R/8 does not participate in reaction
D. Effectiveness factor for a zero order reaction cannot be 7/8 as it must always be 1 - Enzymes are destroyed, when the_______________?
A. Temperature is very high
B. Reactant’s concentration is very high
C. Reactant’s concentration is very low
D. Reaction rate is independent of the reactant’s concentration - A catalyst promoter_________________?
A. Improves the activity of a catalyst
B. Acts as a catalyst support
C. Itself has very high activity
D. All A., B. and C. - A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by__________________?
A. Diffusion within the pellet
B. Reaction
C. External mass transfer
D. None of the above - The importance of diffusion in a catalyst are increased by ____________________?
A. Large catalyst particle size
B. An active surface of the catalyst
C. Small pore diameter
D. All A., B. and C. - The reason why a catalyst increases the rate of reaction is that, it______________?
A. Decreases the energy barrier for reaction
B. Increases the activation energy
C. Decreases the molecular collision diameter
D. None of these - ‘If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process’. The diffusivity under this condition is called ‘Knudsen diffusivity’, which is affected by the_____________________?
A. Pressure
B. Temperature
C. Both A. & B.
D. Neither A. nor B.
