Related Questions

Which one is the rate controlling step in a solid-gas non-catalytic reaction occurring at very high temperature?
A Pore diffusion
B Film diffusion
C Ash layer diffusion
D Chemical reaction
If pore diffusion is the controlling step in a solid catalysed reaction, the catalyst
A Porosity is very important
B Porosity is of less importance
C Internal surface area is utilised efficiently
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
Rate determining step in a reaction consisting of a number of steps in series is the __________ step.
A Fastest
B Slowest
C Intermediate
D Data insufficient; can't be predicted
When the reaction occurs in the diffusion controlled region, the apparent activation energy as measured is only __________ the true value.
A Twice
B Half
C Equal
D None of these
Overall rate of reaction in a heterogenous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually __________ the concentration of catalyst, if it does not entail a chain mechanism.
A Proportional to
B Independent of
C Inversely proportional to
D Proportional to the square of
Ordinary diffusion process is also called __________ diffusion.
A Pressure
B Thermal
C Concentration
D Forced
Which of the following is a controlling factor in very fast heterogeneous reaction?
A Heat and mass transfer effects
B Pressure
C Temperature
D Composition of reactant
The rate controlling step in the manufacture of silicone rubber is the
A Polymer termination step
B Condensation of siloxane to silicone
C Initial hydrolysis of silicone monomer
D None of these
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

Next steps