Related Questions

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
The time needed to achieve the same fractional conversion for particles of different sizes (d) when chemical reaction controls, is proportional to
A d
B $$\sqrt {\text{d}} $$
C d1.5
D d2
__________ 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 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
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
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as
A Conduction
B Free convection
C Forced convection
D Radiation
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
একটি কণা t = 0 সময়ে স্থির অবস্থা থেকে যাত্রা শুরু করে। কণাটির ওপর প্রযুক্ত লব্ধি বল, সময় t এর সমানুপাতিক। কণাটির গতিশক্তি নিচের কোনটির সমানুপাতিক হবে? (A particle starts from rest at t = 0. The net force acting on the particle is proportional to time t. Its kinetic energy is proportional to which one of the following?)
A t2
B t3
C t
D t4
Fractional conversion __________ for an exothermic reversible chemical reaction, when the temperature is maximum.
A Increases
B Remains unchanged
C Decreases
D Unpredictable from the data
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

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