Related Questions

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
__________ 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
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
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 a solid-gas non-catalytic reaction occurs at very high temperature, the rate controlling step is the __________ diffusion.
A Film
B Ash layer
C Pore
D None of these
A catalytic agent such platinum may be used so that the chemical reaction reaction more rapidly .
A such
B that
C reaction
D rapidly
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
Which of the following resistances is not involved in a gas phase catalytic (gas- solid) reaction?
A Ash resistance
B Gas film and pore surface diffusion resistances for reactants
C Surface phenomenon resistance
D Gas film and pore surface diffusion resistances for products
For the non catalytic reaction of particles with surrounding fluid, the same needed to achive the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the __________ is the controlling resistance.
A Film diffusion
B Diffusion through ash layer
C Chemical reaction
D Either A, B or C
For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the __________ is the controlling resistance.
A Film diffusion
B Diffusion through ash layer
C Chemical reaction
D Either A, B or C

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