Related Questions

For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the __________ adsorption.
A Physical
B Chemical
C Both A and B
D Neither A nor B
Catalytic action in a catalytic chemical reaction follows from the ability of catalyst to change the
A Activation energy
B Equilibrium constant
C Heat of reaction
D None of these
__________ is the controlling step in a highly temperature sensitive fluid-solid non-catalytic reaction.
A Gas film diffusion
B Ash diffusion
C Chemical reaction
D None of these
Overall mass transfer co-efficient in case of absorption of __________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling.
A CO2
B SO2
C NH3
D None of these
Which of the following is not a chemical step in a fluid solid catalytic reaction?
A Surface chemical reaction
B Adsorption
C Desorption
D None of these
Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the
A Existence of thermal boundary layer
B Temperature gradient produced due to density difference
C Buoyancy of the bubbles produced at active nucleation site
D None of these
Non-catalytic fluid-solid reactions are represented by __________ model.
A Continuous reaction
B Unreacted core
C Both A and B
D Neither A and B
The equilibrium constant of a catalytic chemical reaction __________ due to the presence of a catalyst.
A Increases
B Decreases
C Remains unaffected
D Unpredictable from the data
Effectiveness factor (E) of a catalyst pellet is defined as, E = (actual rate within pore of catalyst/rate if notsnowed 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
In the Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is __________ the fluid viscosity.
A Directly proportional to
B Inversely proportional to
C Inversely proportional to the square root of
D Independent of

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